eventespresso / event-espresso-core

admin_pages/transactions/Transactions_Admin_Page.core.php

Indentation +2556 added lines, -2556 removed lines

@@ -14,2560 +14,2560 @@
 class Transactions_Admin_Page extends EE_Admin_Page
 {
 
-    /**
-     * @var EE_Transaction
-     */
-    private $_transaction;
-
-    /**
-     * @var EE_Session
-     */
-    private $_session;
-
-    /**
-     * @var array $_txn_status
-     */
-    private static $_txn_status;
-
-    /**
-     * @var array $_pay_status
-     */
-    private static $_pay_status;
-
-    /**
-     * @var array $_existing_reg_payment_REG_IDs
-     */
-    protected $_existing_reg_payment_REG_IDs = null;
-
-
-    /**
-     * @Constructor
-     * @access public
-     * @param bool $routing
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws ReflectionException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     */
-    public function __construct($routing = true)
-    {
-        parent::__construct($routing);
-    }
-
-
-    /**
-     *    _init_page_props
-     *
-     * @return void
-     */
-    protected function _init_page_props()
-    {
-        $this->page_slug = TXN_PG_SLUG;
-        $this->page_label = esc_html__('Transactions', 'event_espresso');
-        $this->_admin_base_url = TXN_ADMIN_URL;
-        $this->_admin_base_path = TXN_ADMIN;
-    }
-
-
-    /**
-     *    _ajax_hooks
-     *
-     * @return void
-     */
-    protected function _ajax_hooks()
-    {
-        add_action('wp_ajax_espresso_apply_payment', array($this, 'apply_payments_or_refunds'));
-        add_action('wp_ajax_espresso_apply_refund', array($this, 'apply_payments_or_refunds'));
-        add_action('wp_ajax_espresso_delete_payment', array($this, 'delete_payment'));
-    }
-
-
-    /**
-     *    _define_page_props
-     *
-     * @return void
-     */
-    protected function _define_page_props()
-    {
-        $this->_admin_page_title = $this->page_label;
-        $this->_labels = array(
-            'buttons' => array(
-                'add'    => esc_html__('Add New Transaction', 'event_espresso'),
-                'edit'   => esc_html__('Edit Transaction', 'event_espresso'),
-                'delete' => esc_html__('Delete Transaction', 'event_espresso'),
-            ),
-        );
-    }
-
-
-    /**
-     *        grab url requests and route them
-     *
-     * @access private
-     * @return void
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     */
-    public function _set_page_routes()
-    {
-
-        $this->_set_transaction_status_array();
-
-        $txn_id = ! empty($this->_req_data['TXN_ID'])
-                  && ! is_array($this->_req_data['TXN_ID'])
-            ? $this->_req_data['TXN_ID']
-            : 0;
-
-        $this->_page_routes = array(
-
-            'default' => array(
-                'func'       => '_transactions_overview_list_table',
-                'capability' => 'ee_read_transactions',
-            ),
-
-            'view_transaction' => array(
-                'func'       => '_transaction_details',
-                'capability' => 'ee_read_transaction',
-                'obj_id'     => $txn_id,
-            ),
-
-            'send_payment_reminder' => array(
-                'func'       => '_send_payment_reminder',
-                'noheader'   => true,
-                'capability' => 'ee_send_message',
-            ),
-
-            'espresso_apply_payment' => array(
-                'func'       => 'apply_payments_or_refunds',
-                'noheader'   => true,
-                'capability' => 'ee_edit_payments',
-            ),
-
-            'espresso_apply_refund' => array(
-                'func'       => 'apply_payments_or_refunds',
-                'noheader'   => true,
-                'capability' => 'ee_edit_payments',
-            ),
-
-            'espresso_delete_payment' => array(
-                'func'       => 'delete_payment',
-                'noheader'   => true,
-                'capability' => 'ee_delete_payments',
-            ),
-
-            'espresso_recalculate_line_items' => array(
-                'func'       => 'recalculateLineItems',
-                'noheader'   => true,
-                'capability' => 'ee_edit_payments',
-            ),
-
-        );
-    }
-
-
-    protected function _set_page_config()
-    {
-        $this->_page_config = array(
-            'default'          => array(
-                'nav'           => array(
-                    'label' => esc_html__('Overview', 'event_espresso'),
-                    'order' => 10,
-                ),
-                'list_table'    => 'EE_Admin_Transactions_List_Table',
-                'help_tabs'     => array(
-                    'transactions_overview_help_tab'                       => array(
-                        'title'    => esc_html__('Transactions Overview', 'event_espresso'),
-                        'filename' => 'transactions_overview',
-                    ),
-                    'transactions_overview_table_column_headings_help_tab' => array(
-                        'title'    => esc_html__('Transactions Table Column Headings', 'event_espresso'),
-                        'filename' => 'transactions_overview_table_column_headings',
-                    ),
-                    'transactions_overview_views_filters_help_tab'         => array(
-                        'title'    => esc_html__('Transaction Views & Filters & Search', 'event_espresso'),
-                        'filename' => 'transactions_overview_views_filters_search',
-                    ),
-                ),
-                'help_tour'     => array('Transactions_Overview_Help_Tour'),
-                /**
-                 * commented out because currently we are not displaying tips for transaction list table status but this
-                 * may change in a later iteration so want to keep the code for then.
-                 */
-                // 'qtips' => array( 'Transactions_List_Table_Tips' ),
-                'require_nonce' => false,
-            ),
-            'view_transaction' => array(
-                'nav'       => array(
-                    'label'      => esc_html__('View Transaction', 'event_espresso'),
-                    'order'      => 5,
-                    'url'        => isset($this->_req_data['TXN_ID'])
-                        ? add_query_arg(array('TXN_ID' => $this->_req_data['TXN_ID']), $this->_current_page_view_url)
-                        : $this->_admin_base_url,
-                    'persistent' => false,
-                ),
-                'help_tabs' => array(
-                    'transactions_view_transaction_help_tab'                                              => array(
-                        'title'    => esc_html__('View Transaction', 'event_espresso'),
-                        'filename' => 'transactions_view_transaction',
-                    ),
-                    'transactions_view_transaction_transaction_details_table_help_tab'                    => array(
-                        'title'    => esc_html__('Transaction Details Table', 'event_espresso'),
-                        'filename' => 'transactions_view_transaction_transaction_details_table',
-                    ),
-                    'transactions_view_transaction_attendees_registered_help_tab'                         => array(
-                        'title'    => esc_html__('Attendees Registered', 'event_espresso'),
-                        'filename' => 'transactions_view_transaction_attendees_registered',
-                    ),
-                    'transactions_view_transaction_views_primary_registrant_billing_information_help_tab' => array(
-                        'title'    => esc_html__('Primary Registrant & Billing Information', 'event_espresso'),
-                        'filename' => 'transactions_view_transaction_primary_registrant_billing_information',
-                    ),
-                ),
-                'qtips'     => array('Transaction_Details_Tips'),
-                'help_tour' => array('Transaction_Details_Help_Tour'),
-                'metaboxes' => array('_transaction_details_metaboxes'),
-
-                'require_nonce' => false,
-            ),
-        );
-    }
-
-
-    /**
-     * The below methods aren't used by this class currently
-     */
-    protected function _add_screen_options()
-    {
-        // noop
-    }
-
-    protected function _add_feature_pointers()
-    {
-        // noop
-    }
-
-    public function admin_init()
-    {
-        // IF a registration was JUST added via the admin...
-        if (isset(
-            $this->_req_data['redirect_from'],
-            $this->_req_data['EVT_ID'],
-            $this->_req_data['event_name']
-        )) {
-            // then set a cookie so that we can block any attempts to use
-            // the back button as a way to enter another registration.
-            setcookie(
-                'ee_registration_added',
-                $this->_req_data['EVT_ID'],
-                time() + WEEK_IN_SECONDS,
-                '/'
-            );
-            // and update the global
-            $_COOKIE['ee_registration_added'] = $this->_req_data['EVT_ID'];
-        }
-        EE_Registry::$i18n_js_strings['invalid_server_response'] = esc_html__(
-            'An error occurred! Your request may have been processed, but a valid response from the server was not received. Please refresh the page and try again.',
-            'event_espresso'
-        );
-        EE_Registry::$i18n_js_strings['error_occurred'] = esc_html__(
-            'An error occurred! Please refresh the page and try again.',
-            'event_espresso'
-        );
-        EE_Registry::$i18n_js_strings['txn_status_array'] = self::$_txn_status;
-        EE_Registry::$i18n_js_strings['pay_status_array'] = self::$_pay_status;
-        EE_Registry::$i18n_js_strings['payments_total'] = esc_html__('Payments Total', 'event_espresso');
-        EE_Registry::$i18n_js_strings['transaction_overpaid'] = esc_html__(
-            'This transaction has been overpaid ! Payments Total',
-            'event_espresso'
-        );
-    }
-
-    public function admin_notices()
-    {
-        // noop
-    }
-
-    public function admin_footer_scripts()
-    {
-        // noop
-    }
-
-
-    /**
-     * _set_transaction_status_array
-     * sets list of transaction statuses
-     *
-     * @access private
-     * @return void
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     */
-    private function _set_transaction_status_array()
-    {
-        self::$_txn_status = EEM_Transaction::instance()->status_array(true);
-    }
-
-
-    /**
-     * get_transaction_status_array
-     * return the transaction status array for wp_list_table
-     *
-     * @access public
-     * @return array
-     */
-    public function get_transaction_status_array()
-    {
-        return self::$_txn_status;
-    }
-
-
-    /**
-     *    get list of payment statuses
-     *
-     * @access private
-     * @return void
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     */
-    private function _get_payment_status_array()
-    {
-        self::$_pay_status = EEM_Payment::instance()->status_array(true);
-        $this->_template_args['payment_status'] = self::$_pay_status;
-    }
-
-
-    /**
-     *    _add_screen_options_default
-     *
-     * @access protected
-     * @return void
-     * @throws InvalidArgumentException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     */
-    protected function _add_screen_options_default()
-    {
-        $this->_per_page_screen_option();
-    }
-
-
-    /**
-     * load_scripts_styles
-     *
-     * @access public
-     * @return void
-     */
-    public function load_scripts_styles()
-    {
-        // enqueue style
-        wp_register_style(
-            'espresso_txn',
-            TXN_ASSETS_URL . 'espresso_transactions_admin.css',
-            array(),
-            EVENT_ESPRESSO_VERSION
-        );
-        wp_enqueue_style('espresso_txn');
-        // scripts
-        wp_register_script(
-            'espresso_txn',
-            TXN_ASSETS_URL . 'espresso_transactions_admin.js',
-            array(
-                'ee_admin_js',
-                'ee-datepicker',
-                'jquery-ui-datepicker',
-                'jquery-ui-draggable',
-                'ee-dialog',
-                'ee-accounting',
-                'ee-serialize-full-array',
-            ),
-            EVENT_ESPRESSO_VERSION,
-            true
-        );
-        wp_enqueue_script('espresso_txn');
-    }
-
-
-    /**
-     *    load_scripts_styles_view_transaction
-     *
-     * @access public
-     * @return void
-     */
-    public function load_scripts_styles_view_transaction()
-    {
-        // styles
-        wp_enqueue_style('espresso-ui-theme');
-    }
-
-
-    /**
-     *    load_scripts_styles_default
-     *
-     * @access public
-     * @return void
-     */
-    public function load_scripts_styles_default()
-    {
-        // styles
-        wp_enqueue_style('espresso-ui-theme');
-    }
-
-
-    /**
-     *    _set_list_table_views_default
-     *
-     * @access protected
-     * @return void
-     */
-    protected function _set_list_table_views_default()
-    {
-        $this->_views = array(
-            'all'       => array(
-                'slug'  => 'all',
-                'label' => esc_html__('View All Transactions', 'event_espresso'),
-                'count' => 0,
-            ),
-            'abandoned' => array(
-                'slug'  => 'abandoned',
-                'label' => esc_html__('Abandoned Transactions', 'event_espresso'),
-                'count' => 0,
-            ),
-            'incomplete' => array(
-                'slug'  => 'incomplete',
-                'label' => esc_html__('Incomplete Transactions', 'event_espresso'),
-                'count' => 0,
-            )
-        );
-        if (/**
-             * Filters whether a link to the "Failed Transactions" list table
-             * appears on the Transactions Admin Page list table.
-             * List display can be turned back on via the following:
-             * add_filter(
-             *     'FHEE__Transactions_Admin_Page___set_list_table_views_default__display_failed_txns_list',
-             *     '__return_true'
-             * );
-             *
-             * @since 4.9.70.p
-             * @param boolean                 $display_failed_txns_list
-             * @param Transactions_Admin_Page $this
-             */
-            apply_filters(
-                'FHEE__Transactions_Admin_Page___set_list_table_views_default__display_failed_txns_list',
-                false,
-                $this
-            )
-        ) {
-            $this->_views['failed'] = array(
-                'slug'  => 'failed',
-                'label' => esc_html__('Failed Transactions', 'event_espresso'),
-                'count' => 0,
-            );
-        }
-    }
-
-
-    /**
-     * _set_transaction_object
-     * This sets the _transaction property for the transaction details screen
-     *
-     * @access private
-     * @return void
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws RuntimeException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     * @throws ReflectionException
-     */
-    private function _set_transaction_object()
-    {
-        if ($this->_transaction instanceof EE_Transaction) {
-            return;
-        } //get out we've already set the object
-
-        $TXN_ID = ! empty($this->_req_data['TXN_ID'])
-            ? absint($this->_req_data['TXN_ID'])
-            : false;
-
-        // get transaction object
-        $this->_transaction = EEM_Transaction::instance()->get_one_by_ID($TXN_ID);
-        $this->_session = $this->_transaction instanceof EE_Transaction
-            ? $this->_transaction->get('TXN_session_data')
-            : null;
-        if ($this->_transaction instanceof EE_Transaction) {
-            $this->_transaction->verify_abandoned_transaction_status();
-        }
-
-        if (! $this->_transaction instanceof EE_Transaction) {
-            $error_msg = sprintf(
-                esc_html__(
-                    'An error occurred and the details for the transaction with the ID # %d could not be retrieved.',
-                    'event_espresso'
-                ),
-                $TXN_ID
-            );
-            EE_Error::add_error($error_msg, __FILE__, __FUNCTION__, __LINE__);
-        }
-    }
-
-
-    /**
-     *    _transaction_legend_items
-     *
-     * @access protected
-     * @return array
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws ReflectionException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     */
-    protected function _transaction_legend_items()
-    {
-        EE_Registry::instance()->load_helper('MSG_Template');
-        $items = array();
-
-        if (EE_Registry::instance()->CAP->current_user_can(
-            'ee_read_global_messages',
-            'view_filtered_messages'
-        )) {
-            $related_for_icon = EEH_MSG_Template::get_message_action_icon('see_notifications_for');
-            if (is_array($related_for_icon)
-                && isset($related_for_icon['css_class'], $related_for_icon['label'])
-            ) {
-                $items['view_related_messages'] = array(
-                    'class' => $related_for_icon['css_class'],
-                    'desc'  => $related_for_icon['label'],
-                );
-            }
-        }
-
-        $items = apply_filters(
-            'FHEE__Transactions_Admin_Page___transaction_legend_items__items',
-            array_merge(
-                $items,
-                array(
-                    'view_details'          => array(
-                        'class' => 'dashicons dashicons-cart',
-                        'desc'  => esc_html__('View Transaction Details', 'event_espresso'),
-                    ),
-                    'view_invoice'          => array(
-                        'class' => 'dashicons dashicons-media-spreadsheet',
-                        'desc'  => esc_html__('View Transaction Invoice', 'event_espresso'),
-                    ),
-                    'view_receipt'          => array(
-                        'class' => 'dashicons dashicons-media-default',
-                        'desc'  => esc_html__('View Transaction Receipt', 'event_espresso'),
-                    ),
-                    'view_registration'     => array(
-                        'class' => 'dashicons dashicons-clipboard',
-                        'desc'  => esc_html__('View Registration Details', 'event_espresso'),
-                    ),
-                    'payment_overview_link' => array(
-                        'class' => 'dashicons dashicons-money',
-                        'desc'  => esc_html__('Make Payment on Frontend', 'event_espresso'),
-                    ),
-                )
-            )
-        );
-
-        if (EE_Registry::instance()->CAP->current_user_can(
-            'ee_send_message',
-            'espresso_transactions_send_payment_reminder'
-        )) {
-            if (EEH_MSG_Template::is_mt_active('payment_reminder')) {
-                $items['send_payment_reminder'] = array(
-                    'class' => 'dashicons dashicons-email-alt',
-                    'desc'  => esc_html__('Send Payment Reminder', 'event_espresso'),
-                );
-            } else {
-                $items['blank*'] = array(
-                    'class' => '',
-                    'desc'  => '',
-                );
-            }
-        } else {
-            $items['blank*'] = array(
-                'class' => '',
-                'desc'  => '',
-            );
-        }
-        $more_items = apply_filters(
-            'FHEE__Transactions_Admin_Page___transaction_legend_items__more_items',
-            array(
-                'overpaid'   => array(
-                    'class' => 'ee-status-legend ee-status-legend-' . EEM_Transaction::overpaid_status_code,
-                    'desc'  => EEH_Template::pretty_status(
-                        EEM_Transaction::overpaid_status_code,
-                        false,
-                        'sentence'
-                    ),
-                ),
-                'complete'   => array(
-                    'class' => 'ee-status-legend ee-status-legend-' . EEM_Transaction::complete_status_code,
-                    'desc'  => EEH_Template::pretty_status(
-                        EEM_Transaction::complete_status_code,
-                        false,
-                        'sentence'
-                    ),
-                ),
-                'incomplete' => array(
-                    'class' => 'ee-status-legend ee-status-legend-' . EEM_Transaction::incomplete_status_code,
-                    'desc'  => EEH_Template::pretty_status(
-                        EEM_Transaction::incomplete_status_code,
-                        false,
-                        'sentence'
-                    ),
-                ),
-                'abandoned'  => array(
-                    'class' => 'ee-status-legend ee-status-legend-' . EEM_Transaction::abandoned_status_code,
-                    'desc'  => EEH_Template::pretty_status(
-                        EEM_Transaction::abandoned_status_code,
-                        false,
-                        'sentence'
-                    ),
-                ),
-                'failed'     => array(
-                    'class' => 'ee-status-legend ee-status-legend-' . EEM_Transaction::failed_status_code,
-                    'desc'  => EEH_Template::pretty_status(
-                        EEM_Transaction::failed_status_code,
-                        false,
-                        'sentence'
-                    ),
-                ),
-            )
-        );
-
-        return array_merge($items, $more_items);
-    }
-
-
-    /**
-     *    _transactions_overview_list_table
-     *
-     * @access protected
-     * @return void
-     * @throws DomainException
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     * @throws ReflectionException
-     */
-    protected function _transactions_overview_list_table()
-    {
-        $this->_admin_page_title = esc_html__('Transactions', 'event_espresso');
-        $event = isset($this->_req_data['EVT_ID'])
-            ? EEM_Event::instance()->get_one_by_ID($this->_req_data['EVT_ID'])
-            : null;
-        $this->_template_args['admin_page_header'] = $event instanceof EE_Event
-            ? sprintf(
-                esc_html__(
-                    '%sViewing Transactions for the Event: %s%s',
-                    'event_espresso'
-                ),
-                '<h3>',
-                '<a href="'
-                . EE_Admin_Page::add_query_args_and_nonce(
-                    array('action' => 'edit', 'post' => $event->ID()),
-                    EVENTS_ADMIN_URL
-                )
-                . '" title="'
-                . esc_attr__(
-                    'Click to Edit event',
-                    'event_espresso'
-                )
-                . '">' . $event->get('EVT_name') . '</a>',
-                '</h3>'
-            )
-            : '';
-        $this->_template_args['after_list_table'] = $this->_display_legend($this->_transaction_legend_items());
-        $this->display_admin_list_table_page_with_no_sidebar();
-    }
-
-
-    /**
-     *    _transaction_details
-     * generates HTML for the View Transaction Details Admin page
-     *
-     * @access protected
-     * @return void
-     * @throws DomainException
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     * @throws RuntimeException
-     * @throws ReflectionException
-     */
-    protected function _transaction_details()
-    {
-        do_action('AHEE__Transactions_Admin_Page__transaction_details__start', $this->_transaction);
-
-        $this->_set_transaction_status_array();
-
-        $this->_template_args = array();
-        $this->_template_args['transactions_page'] = $this->_wp_page_slug;
-
-        $this->_set_transaction_object();
-
-        if (! $this->_transaction instanceof EE_Transaction) {
-            return;
-        }
-        $primary_registration = $this->_transaction->primary_registration();
-        $attendee = $primary_registration instanceof EE_Registration
-            ? $primary_registration->attendee()
-            : null;
-
-        $this->_template_args['txn_nmbr']['value'] = $this->_transaction->ID();
-        $this->_template_args['txn_nmbr']['label'] = esc_html__('Transaction Number', 'event_espresso');
-
-        $this->_template_args['txn_datetime']['value'] = $this->_transaction->get_i18n_datetime('TXN_timestamp');
-        $this->_template_args['txn_datetime']['label'] = esc_html__('Date', 'event_espresso');
-
-        $this->_template_args['txn_status']['value'] = self::$_txn_status[ $this->_transaction->get('STS_ID') ];
-        $this->_template_args['txn_status']['label'] = esc_html__('Transaction Status', 'event_espresso');
-        $this->_template_args['txn_status']['class'] = 'status-' . $this->_transaction->get('STS_ID');
-
-        $this->_template_args['grand_total'] = $this->_transaction->get('TXN_total');
-        $this->_template_args['total_paid'] = $this->_transaction->get('TXN_paid');
-
-        $amount_due = $this->_transaction->get('TXN_total') - $this->_transaction->get('TXN_paid');
-        $this->_template_args['amount_due'] = EEH_Template::format_currency(
-            $amount_due,
-            true
-        );
-        if (EE_Registry::instance()->CFG->currency->sign_b4) {
-            $this->_template_args['amount_due'] = EE_Registry::instance()->CFG->currency->sign
-                                                  . $this->_template_args['amount_due'];
-        } else {
-            $this->_template_args['amount_due'] .= EE_Registry::instance()->CFG->currency->sign;
-        }
-        $this->_template_args['amount_due_class'] = '';
-
-        if ($this->_transaction->get('TXN_paid') == $this->_transaction->get('TXN_total')) {
-            // paid in full
-            $this->_template_args['amount_due'] = false;
-        } elseif ($this->_transaction->get('TXN_paid') > $this->_transaction->get('TXN_total')) {
-            // overpaid
-            $this->_template_args['amount_due_class'] = 'txn-overview-no-payment-spn';
-        } elseif ($this->_transaction->get('TXN_total') > 0
-                  && $this->_transaction->get('TXN_paid') > 0
-        ) {
-            // monies owing
-            $this->_template_args['amount_due_class'] = 'txn-overview-part-payment-spn';
-        } elseif ($this->_transaction->get('TXN_total') > 0
-                  && $this->_transaction->get('TXN_paid') == 0
-        ) {
-            // no payments made yet
-            $this->_template_args['amount_due_class'] = 'txn-overview-no-payment-spn';
-        } elseif ($this->_transaction->get('TXN_total') == 0) {
-            // free event
-            $this->_template_args['amount_due'] = false;
-        }
-
-        $payment_method = $this->_transaction->payment_method();
-
-        $this->_template_args['method_of_payment_name'] = $payment_method instanceof EE_Payment_Method
-            ? $payment_method->admin_name()
-            : esc_html__('Unknown', 'event_espresso');
-
-        $this->_template_args['currency_sign'] = EE_Registry::instance()->CFG->currency->sign;
-        // link back to overview
-        $this->_template_args['txn_overview_url'] = ! empty($_SERVER['HTTP_REFERER'])
-            ? $_SERVER['HTTP_REFERER']
-            : TXN_ADMIN_URL;
-
-
-        // next link
-        $next_txn = $this->_transaction->next(
-            null,
-            array(array('STS_ID' => array('!=', EEM_Transaction::failed_status_code))),
-            'TXN_ID'
-        );
-        $this->_template_args['next_transaction'] = $next_txn
-            ? $this->_next_link(
-                EE_Admin_Page::add_query_args_and_nonce(
-                    array('action' => 'view_transaction', 'TXN_ID' => $next_txn['TXN_ID']),
-                    TXN_ADMIN_URL
-                ),
-                'dashicons dashicons-arrow-right ee-icon-size-22'
-            )
-            : '';
-        // previous link
-        $previous_txn = $this->_transaction->previous(
-            null,
-            array(array('STS_ID' => array('!=', EEM_Transaction::failed_status_code))),
-            'TXN_ID'
-        );
-        $this->_template_args['previous_transaction'] = $previous_txn
-            ? $this->_previous_link(
-                EE_Admin_Page::add_query_args_and_nonce(
-                    array('action' => 'view_transaction', 'TXN_ID' => $previous_txn['TXN_ID']),
-                    TXN_ADMIN_URL
-                ),
-                'dashicons dashicons-arrow-left ee-icon-size-22'
-            )
-            : '';
-
-        // were we just redirected here after adding a new registration ???
-        if (isset(
-            $this->_req_data['redirect_from'],
-            $this->_req_data['EVT_ID'],
-            $this->_req_data['event_name']
-        )) {
-            if (EE_Registry::instance()->CAP->current_user_can(
-                'ee_edit_registrations',
-                'espresso_registrations_new_registration',
-                $this->_req_data['EVT_ID']
-            )) {
-                $this->_admin_page_title .= '<a id="add-new-registration" class="add-new-h2 button-primary" href="';
-                $this->_admin_page_title .= EE_Admin_Page::add_query_args_and_nonce(
-                    array(
-                        'page'     => 'espresso_registrations',
-                        'action'   => 'new_registration',
-                        'return'   => 'default',
-                        'TXN_ID'   => $this->_transaction->ID(),
-                        'event_id' => $this->_req_data['EVT_ID'],
-                    ),
-                    REG_ADMIN_URL
-                );
-                $this->_admin_page_title .= '">';
-
-                $this->_admin_page_title .= sprintf(
-                    esc_html__('Add Another New Registration to Event: "%1$s" ?', 'event_espresso'),
-                    htmlentities(urldecode($this->_req_data['event_name']), ENT_QUOTES, 'UTF-8')
-                );
-                $this->_admin_page_title .= '</a>';
-            }
-            EE_Registry::instance()->SSN->clear_session(__CLASS__, __FUNCTION__);
-        }
-        // grab messages at the last second
-        $this->_template_args['notices'] = EE_Error::get_notices();
-        // path to template
-        $template_path = TXN_TEMPLATE_PATH . 'txn_admin_details_header.template.php';
-        $this->_template_args['admin_page_header'] = EEH_Template::display_template(
-            $template_path,
-            $this->_template_args,
-            true
-        );
-
-        // the details template wrapper
-        $this->display_admin_page_with_sidebar();
-    }
-
-
-    /**
-     *        _transaction_details_metaboxes
-     *
-     * @access protected
-     * @return void
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     * @throws RuntimeException
-     * @throws ReflectionException
-     */
-    protected function _transaction_details_metaboxes()
-    {
-
-        $this->_set_transaction_object();
-
-        if (! $this->_transaction instanceof EE_Transaction) {
-            return;
-        }
-        add_meta_box(
-            'edit-txn-details-mbox',
-            esc_html__('Transaction Details', 'event_espresso'),
-            array($this, 'txn_details_meta_box'),
-            $this->_wp_page_slug,
-            'normal',
-            'high'
-        );
-        add_meta_box(
-            'edit-txn-attendees-mbox',
-            esc_html__('Attendees Registered in this Transaction', 'event_espresso'),
-            array($this, 'txn_attendees_meta_box'),
-            $this->_wp_page_slug,
-            'normal',
-            'high',
-            array('TXN_ID' => $this->_transaction->ID())
-        );
-        add_meta_box(
-            'edit-txn-registrant-mbox',
-            esc_html__('Primary Contact', 'event_espresso'),
-            array($this, 'txn_registrant_side_meta_box'),
-            $this->_wp_page_slug,
-            'side',
-            'high'
-        );
-        add_meta_box(
-            'edit-txn-billing-info-mbox',
-            esc_html__('Billing Information', 'event_espresso'),
-            array($this, 'txn_billing_info_side_meta_box'),
-            $this->_wp_page_slug,
-            'side',
-            'high'
-        );
-    }
-
-
-    /**
-     * Callback for transaction actions metabox.
-     *
-     * @param EE_Transaction|null $transaction
-     * @throws DomainException
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     * @throws ReflectionException
-     * @throws RuntimeException
-     */
-    public function getActionButtons(EE_Transaction $transaction = null)
-    {
-        $content = '';
-        $actions = array();
-        if (! $transaction instanceof EE_Transaction) {
-            return $content;
-        }
-        /** @var EE_Registration $primary_registration */
-        $primary_registration = $transaction->primary_registration();
-        $attendee = $primary_registration instanceof EE_Registration
-            ? $primary_registration->attendee()
-            : null;
-
-        if ($attendee instanceof EE_Attendee
-            && EE_Registry::instance()->CAP->current_user_can(
-                'ee_send_message',
-                'espresso_transactions_send_payment_reminder'
-            )
-        ) {
-            $actions['payment_reminder'] =
-                EEH_MSG_Template::is_mt_active('payment_reminder')
-                && $this->_transaction->get('STS_ID') !== EEM_Transaction::complete_status_code
-                && $this->_transaction->get('STS_ID') !== EEM_Transaction::overpaid_status_code
-                    ? EEH_Template::get_button_or_link(
-                        EE_Admin_Page::add_query_args_and_nonce(
-                            array(
-                                'action'      => 'send_payment_reminder',
-                                'TXN_ID'      => $this->_transaction->ID(),
-                                'redirect_to' => 'view_transaction',
-                            ),
-                            TXN_ADMIN_URL
-                        ),
-                        esc_html__(' Send Payment Reminder', 'event_espresso'),
-                        'button secondary-button',
-                        'dashicons dashicons-email-alt'
-                    )
-                    : '';
-        }
-
-        if (EE_Registry::instance()->CAP->current_user_can(
-            'ee_edit_payments',
-            'espresso_transactions_recalculate_line_items'
-        )
-        ) {
-            $actions['recalculate_line_items'] = EEH_Template::get_button_or_link(
-                EE_Admin_Page::add_query_args_and_nonce(
-                    array(
-                        'action'      => 'espresso_recalculate_line_items',
-                        'TXN_ID'      => $this->_transaction->ID(),
-                        'redirect_to' => 'view_transaction',
-                    ),
-                    TXN_ADMIN_URL
-                ),
-                esc_html__(' Recalculate Taxes and Total', 'event_espresso'),
-                'button secondary-button',
-                'dashicons dashicons-update'
-            );
-        }
-
-        if ($primary_registration instanceof EE_Registration
-            && EEH_MSG_Template::is_mt_active('receipt')
-        ) {
-            $actions['receipt'] = EEH_Template::get_button_or_link(
-                $primary_registration->receipt_url(),
-                esc_html__('View Receipt', 'event_espresso'),
-                'button secondary-button',
-                'dashicons dashicons-media-default'
-            );
-        }
-
-        if ($primary_registration instanceof EE_Registration
-            && EEH_MSG_Template::is_mt_active('invoice')
-        ) {
-            $actions['invoice'] = EEH_Template::get_button_or_link(
-                $primary_registration->invoice_url(),
-                esc_html__('View Invoice', 'event_espresso'),
-                'button secondary-button',
-                'dashicons dashicons-media-spreadsheet'
-            );
-        }
-        $actions = array_filter(
-            apply_filters('FHEE__Transactions_Admin_Page__getActionButtons__actions', $actions, $transaction)
-        );
-        if ($actions) {
-            $content = '<ul>';
-            $content .= '<li>' . implode('</li><li>', $actions) . '</li>';
-            $content .= '</uL>';
-        }
-        return $content;
-    }
-
-
-    /**
-     * txn_details_meta_box
-     * generates HTML for the Transaction main meta box
-     *
-     * @return void
-     * @throws DomainException
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     * @throws RuntimeException
-     * @throws ReflectionException
-     */
-    public function txn_details_meta_box()
-    {
-        $this->_set_transaction_object();
-        $this->_template_args['TXN_ID'] = $this->_transaction->ID();
-        $this->_template_args['attendee'] = $this->_transaction->primary_registration() instanceof EE_Registration
-            ? $this->_transaction->primary_registration()->attendee()
-            : null;
-        $this->_template_args['can_edit_payments'] = EE_Registry::instance()->CAP->current_user_can(
-            'ee_edit_payments',
-            'apply_payment_or_refund_from_registration_details'
-        );
-        $this->_template_args['can_delete_payments'] = EE_Registry::instance()->CAP->current_user_can(
-            'ee_delete_payments',
-            'delete_payment_from_registration_details'
-        );
-
-        // get line table
-        EEH_Autoloader::register_line_item_display_autoloaders();
-        $Line_Item_Display = new EE_Line_Item_Display(
-            'admin_table',
-            'EE_Admin_Table_Line_Item_Display_Strategy'
-        );
-        $this->_template_args['line_item_table'] = $Line_Item_Display->display_line_item(
-            $this->_transaction->total_line_item()
-        );
-        $this->_template_args['REG_code'] = $this->_transaction->get_first_related('Registration')
-                                                               ->get('REG_code');
-
-        // process taxes
-        $taxes = $this->_transaction->get_many_related(
-            'Line_Item',
-            array(array('LIN_type' => EEM_Line_Item::type_tax))
-        );
-        $this->_template_args['taxes'] = ! empty($taxes) ? $taxes : false;
-
-        $this->_template_args['grand_total'] = EEH_Template::format_currency(
-            $this->_transaction->get('TXN_total'),
-            false,
-            false
-        );
-        $this->_template_args['grand_raw_total'] = $this->_transaction->get('TXN_total');
-        $this->_template_args['TXN_status'] = $this->_transaction->get('STS_ID');
-
-        // process payment details
-        $payments = $this->_transaction->get_many_related('Payment');
-        if (! empty($payments)) {
-            $this->_template_args['payments'] = $payments;
-            $this->_template_args['existing_reg_payments'] = $this->_get_registration_payment_IDs($payments);
-        } else {
-            $this->_template_args['payments'] = false;
-            $this->_template_args['existing_reg_payments'] = array();
-        }
-
-        $this->_template_args['edit_payment_url'] = add_query_arg(array('action' => 'edit_payment'), TXN_ADMIN_URL);
-        $this->_template_args['delete_payment_url'] = add_query_arg(
-            array('action' => 'espresso_delete_payment'),
-            TXN_ADMIN_URL
-        );
-
-        if (isset($txn_details['invoice_number'])) {
-            $this->_template_args['txn_details']['invoice_number']['value'] = $this->_template_args['REG_code'];
-            $this->_template_args['txn_details']['invoice_number']['label'] = esc_html__(
-                'Invoice Number',
-                'event_espresso'
-            );
-        }
-
-        $this->_template_args['txn_details']['registration_session']['value'] = $this->_transaction
-            ->get_first_related('Registration')
-            ->get('REG_session');
-        $this->_template_args['txn_details']['registration_session']['label'] = esc_html__(
-            'Registration Session',
-            'event_espresso'
-        );
-
-        $this->_template_args['txn_details']['ip_address']['value'] = isset($this->_session['ip_address'])
-            ? $this->_session['ip_address']
-            : '';
-        $this->_template_args['txn_details']['ip_address']['label'] = esc_html__(
-            'Transaction placed from IP',
-            'event_espresso'
-        );
-
-        $this->_template_args['txn_details']['user_agent']['value'] = isset($this->_session['user_agent'])
-            ? $this->_session['user_agent']
-            : '';
-        $this->_template_args['txn_details']['user_agent']['label'] = esc_html__(
-            'Registrant User Agent',
-            'event_espresso'
-        );
-
-        $reg_steps = '<ul>';
-        foreach ($this->_transaction->reg_steps() as $reg_step => $reg_step_status) {
-            if ($reg_step_status === true) {
-                $reg_steps .= '<li style="color:#70cc50">'
-                              . sprintf(
-                                  esc_html__('%1$s : Completed', 'event_espresso'),
-                                  ucwords(str_replace('_', ' ', $reg_step))
-                              )
-                              . '</li>';
-            } elseif (is_numeric($reg_step_status) && $reg_step_status !== false) {
-                $reg_steps .= '<li style="color:#2EA2CC">'
-                              . sprintf(
-                                  esc_html__('%1$s : Initiated %2$s', 'event_espresso'),
-                                  ucwords(str_replace('_', ' ', $reg_step)),
-                                  date(
-                                      get_option('date_format') . ' ' . get_option('time_format'),
-                                      ($reg_step_status + (get_option('gmt_offset') * HOUR_IN_SECONDS))
-                                  )
-                              )
-                              . '</li>';
-            } else {
-                $reg_steps .= '<li style="color:#E76700">'
-                              . sprintf(
-                                  esc_html__('%1$s : Never Initiated', 'event_espresso'),
-                                  ucwords(str_replace('_', ' ', $reg_step))
-                              )
-                              . '</li>';
-            }
-        }
-        $reg_steps .= '</ul>';
-        $this->_template_args['txn_details']['reg_steps']['value'] = $reg_steps;
-        $this->_template_args['txn_details']['reg_steps']['label'] = esc_html__(
-            'Registration Step Progress',
-            'event_espresso'
-        );
-
-
-        $this->_get_registrations_to_apply_payment_to();
-        $this->_get_payment_methods($payments);
-        $this->_get_payment_status_array();
-        $this->_get_reg_status_selection(); // sets up the template args for the reg status array for the transaction.
-
-        $this->_template_args['transaction_form_url'] = add_query_arg(
-            array(
-                'action'  => 'edit_transaction',
-                'process' => 'transaction',
-            ),
-            TXN_ADMIN_URL
-        );
-        $this->_template_args['apply_payment_form_url'] = add_query_arg(
-            array(
-                'page'   => 'espresso_transactions',
-                'action' => 'espresso_apply_payment',
-            ),
-            WP_AJAX_URL
-        );
-        $this->_template_args['delete_payment_form_url'] = add_query_arg(
-            array(
-                'page'   => 'espresso_transactions',
-                'action' => 'espresso_delete_payment',
-            ),
-            WP_AJAX_URL
-        );
-
-        $this->_template_args['action_buttons'] = $this->getActionButtons($this->_transaction);
-
-        // 'espresso_delete_payment_nonce'
-
-        $template_path = TXN_TEMPLATE_PATH . 'txn_admin_details_main_meta_box_txn_details.template.php';
-        echo EEH_Template::display_template($template_path, $this->_template_args, true);
-    }
-
-
-    /**
-     * _get_registration_payment_IDs
-     *    generates an array of Payment IDs and their corresponding Registration IDs
-     *
-     * @access protected
-     * @param EE_Payment[] $payments
-     * @return array
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     * @throws ReflectionException
-     */
-    protected function _get_registration_payment_IDs($payments = array())
-    {
-        $existing_reg_payments = array();
-        // get all reg payments for these payments
-        $reg_payments = EEM_Registration_Payment::instance()->get_all(
-            array(
-                array(
-                    'PAY_ID' => array(
-                        'IN',
-                        array_keys($payments),
-                    ),
-                ),
-            )
-        );
-        if (! empty($reg_payments)) {
-            foreach ($payments as $payment) {
-                if (! $payment instanceof EE_Payment) {
-                    continue;
-                } elseif (! isset($existing_reg_payments[ $payment->ID() ])) {
-                    $existing_reg_payments[ $payment->ID() ] = array();
-                }
-                foreach ($reg_payments as $reg_payment) {
-                    if ($reg_payment instanceof EE_Registration_Payment
-                        && $reg_payment->payment_ID() === $payment->ID()
-                    ) {
-                        $existing_reg_payments[ $payment->ID() ][] = $reg_payment->registration_ID();
-                    }
-                }
-            }
-        }
-
-        return $existing_reg_payments;
-    }
-
-
-    /**
-     * _get_registrations_to_apply_payment_to
-     *    generates HTML for displaying a series of checkboxes in the admin payment modal window
-     * which allows the admin to only apply the payment to the specific registrations
-     *
-     * @access protected
-     * @return void
-     * @throws \EE_Error
-     */
-    protected function _get_registrations_to_apply_payment_to()
-    {
-        // we want any registration with an active status (ie: not deleted or cancelled)
-        $query_params = array(
-            array(
-                'STS_ID' => array(
-                    'IN',
-                    array(
-                        EEM_Registration::status_id_approved,
-                        EEM_Registration::status_id_pending_payment,
-                        EEM_Registration::status_id_not_approved,
-                    ),
-                ),
-            ),
-        );
-        $registrations_to_apply_payment_to = EEH_HTML::br()
-                                             . EEH_HTML::div(
-                                                 '',
-                                                 'txn-admin-apply-payment-to-registrations-dv',
-                                                 '',
-                                                 'clear: both; margin: 1.5em 0 0; display: none;'
-                                             );
-        $registrations_to_apply_payment_to .= EEH_HTML::br() . EEH_HTML::div('', '', 'admin-primary-mbox-tbl-wrap');
-        $registrations_to_apply_payment_to .= EEH_HTML::table('', '', 'admin-primary-mbox-tbl');
-        $registrations_to_apply_payment_to .= EEH_HTML::thead(
-            EEH_HTML::tr(
-                EEH_HTML::th(esc_html__('ID', 'event_espresso')) .
-                EEH_HTML::th(esc_html__('Registrant', 'event_espresso')) .
-                EEH_HTML::th(esc_html__('Ticket', 'event_espresso')) .
-                EEH_HTML::th(esc_html__('Event', 'event_espresso')) .
-                EEH_HTML::th(esc_html__('Paid', 'event_espresso'), '', 'txn-admin-payment-paid-td jst-cntr') .
-                EEH_HTML::th(esc_html__('Owing', 'event_espresso'), '', 'txn-admin-payment-owing-td jst-cntr') .
-                EEH_HTML::th(esc_html__('Apply', 'event_espresso'), '', 'jst-cntr')
-            )
-        );
-        $registrations_to_apply_payment_to .= EEH_HTML::tbody();
-        // get registrations for TXN
-        $registrations = $this->_transaction->registrations($query_params);
-        $existing_reg_payments = $this->_template_args['existing_reg_payments'];
-        foreach ($registrations as $registration) {
-            if ($registration instanceof EE_Registration) {
-                $attendee_name = $registration->attendee() instanceof EE_Attendee
-                    ? $registration->attendee()->full_name()
-                    : esc_html__('Unknown Attendee', 'event_espresso');
-                $owing = $registration->final_price() - $registration->paid();
-                $taxable = $registration->ticket()->taxable()
-                    ? ' <span class="smaller-text lt-grey-text"> ' . esc_html__('+ tax', 'event_espresso') . '</span>'
-                    : '';
-                $checked = empty($existing_reg_payments) || in_array($registration->ID(), $existing_reg_payments)
-                    ? ' checked="checked"'
-                    : '';
-                $disabled = $registration->final_price() > 0 ? '' : ' disabled';
-                $registrations_to_apply_payment_to .= EEH_HTML::tr(
-                    EEH_HTML::td($registration->ID()) .
-                    EEH_HTML::td($attendee_name) .
-                    EEH_HTML::td(
-                        $registration->ticket()->name() . ' : ' . $registration->ticket()->pretty_price() . $taxable
-                    ) .
-                    EEH_HTML::td($registration->event_name()) .
-                    EEH_HTML::td($registration->pretty_paid(), '', 'txn-admin-payment-paid-td jst-cntr') .
-                    EEH_HTML::td(EEH_Template::format_currency($owing), '', 'txn-admin-payment-owing-td jst-cntr') .
-                    EEH_HTML::td(
-                        '<input type="checkbox" value="' . $registration->ID()
-                        . '" name="txn_admin_payment[registrations]"'
-                        . $checked . $disabled . '>',
-                        '',
-                        'jst-cntr'
-                    ),
-                    'apply-payment-registration-row-' . $registration->ID()
-                );
-            }
-        }
-        $registrations_to_apply_payment_to .= EEH_HTML::tbodyx();
-        $registrations_to_apply_payment_to .= EEH_HTML::tablex();
-        $registrations_to_apply_payment_to .= EEH_HTML::divx();
-        $registrations_to_apply_payment_to .= EEH_HTML::p(
-            esc_html__(
-                'The payment will only be applied to the registrations that have a check mark in their corresponding check box. Checkboxes for free registrations have been disabled.',
-                'event_espresso'
-            ),
-            '',
-            'clear description'
-        );
-        $registrations_to_apply_payment_to .= EEH_HTML::divx();
-        $this->_template_args['registrations_to_apply_payment_to'] = $registrations_to_apply_payment_to;
-    }
-
-
-    /**
-     * _get_reg_status_selection
-     *
-     * @todo   this will need to be adjusted either once MER comes along OR we move default reg status to tickets
-     *         instead of events.
-     * @access protected
-     * @return void
-     * @throws EE_Error
-     */
-    protected function _get_reg_status_selection()
-    {
-        // first get all possible statuses
-        $statuses = EEM_Registration::reg_status_array(array(), true);
-        // let's add a "don't change" option.
-        $status_array['NAN'] = esc_html__('Leave the Same', 'event_espresso');
-        $status_array = array_merge($status_array, $statuses);
-        $this->_template_args['status_change_select'] = EEH_Form_Fields::select_input(
-            'txn_reg_status_change[reg_status]',
-            $status_array,
-            'NAN',
-            'id="txn-admin-payment-reg-status-inp"',
-            'txn-reg-status-change-reg-status'
-        );
-        $this->_template_args['delete_status_change_select'] = EEH_Form_Fields::select_input(
-            'delete_txn_reg_status_change[reg_status]',
-            $status_array,
-            'NAN',
-            'delete-txn-admin-payment-reg-status-inp',
-            'delete-txn-reg-status-change-reg-status'
-        );
-    }
-
-
-    /**
-     *    _get_payment_methods
-     * Gets all the payment methods available generally, or the ones that are already
-     * selected on these payments (in case their payment methods are no longer active).
-     * Has the side-effect of updating the template args' payment_methods item
-     *
-     * @access private
-     * @param EE_Payment[] to show on this page
-     * @return void
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     * @throws ReflectionException
-     */
-    private function _get_payment_methods($payments = array())
-    {
-        $payment_methods_of_payments = array();
-        foreach ($payments as $payment) {
-            if ($payment instanceof EE_Payment) {
-                $payment_methods_of_payments[] = $payment->get('PMD_ID');
-            }
-        }
-        if ($payment_methods_of_payments) {
-            $query_args = array(
-                array(
-                    'OR*payment_method_for_payment' => array(
-                        'PMD_ID'    => array('IN', $payment_methods_of_payments),
-                        'PMD_scope' => array('LIKE', '%' . EEM_Payment_Method::scope_admin . '%'),
-                    ),
-                ),
-            );
-        } else {
-            $query_args = array(array('PMD_scope' => array('LIKE', '%' . EEM_Payment_Method::scope_admin . '%')));
-        }
-        $this->_template_args['payment_methods'] = EEM_Payment_Method::instance()->get_all($query_args);
-    }
-
-
-    /**
-     * txn_attendees_meta_box
-     *    generates HTML for the Attendees Transaction main meta box
-     *
-     * @access public
-     * @param WP_Post $post
-     * @param array   $metabox
-     * @return void
-     * @throws DomainException
-     * @throws EE_Error
-     */
-    public function txn_attendees_meta_box($post, $metabox = array('args' => array()))
-    {
-
-        /** @noinspection NonSecureExtractUsageInspection */
-        extract($metabox['args']);
-        $this->_template_args['post'] = $post;
-        $this->_template_args['event_attendees'] = array();
-        // process items in cart
-        $line_items = $this->_transaction->get_many_related(
-            'Line_Item',
-            array(array('LIN_type' => 'line-item'))
-        );
-        if (! empty($line_items)) {
-            foreach ($line_items as $item) {
-                if ($item instanceof EE_Line_Item) {
-                    switch ($item->OBJ_type()) {
-                        case 'Event':
-                            break;
-                        case 'Ticket':
-                            $ticket = $item->ticket();
-                            // right now we're only handling tickets here.
-                            // Cause its expected that only tickets will have attendees right?
-                            if (! $ticket instanceof EE_Ticket) {
-                                continue;
-                            }
-                            try {
-                                $event_name = $ticket->get_event_name();
-                            } catch (Exception $e) {
-                                EE_Error::add_error($e->getMessage(), __FILE__, __FUNCTION__, __LINE__);
-                                $event_name = esc_html__('Unknown Event', 'event_espresso');
-                            }
-                            $event_name .= ' - ' . $item->get('LIN_name');
-                            $ticket_price = EEH_Template::format_currency($item->get('LIN_unit_price'));
-                            // now get all of the registrations for this transaction that use this ticket
-                            $registrations = $ticket->get_many_related(
-                                'Registration',
-                                array(array('TXN_ID' => $this->_transaction->ID()))
-                            );
-                            foreach ($registrations as $registration) {
-                                if (! $registration instanceof EE_Registration) {
-                                    continue;
-                                }
-                                $this->_template_args['event_attendees'][ $registration->ID() ]['STS_ID']
-                                    = $registration->status_ID();
-                                $this->_template_args['event_attendees'][ $registration->ID() ]['att_num']
-                                    = $registration->count();
-                                $this->_template_args['event_attendees'][ $registration->ID() ]['event_ticket_name']
-                                    = $event_name;
-                                $this->_template_args['event_attendees'][ $registration->ID() ]['ticket_price']
-                                    = $ticket_price;
-                                // attendee info
-                                $attendee = $registration->get_first_related('Attendee');
-                                if ($attendee instanceof EE_Attendee) {
-                                    $this->_template_args['event_attendees'][ $registration->ID() ]['att_id']
-                                        = $attendee->ID();
-                                    $this->_template_args['event_attendees'][ $registration->ID() ]['attendee']
-                                        = $attendee->full_name();
-                                    $this->_template_args['event_attendees'][ $registration->ID() ]['email']
-                                        = '<a href="mailto:' . $attendee->email() . '?subject=' . $event_name
-                                          . esc_html__(
-                                              ' Event',
-                                              'event_espresso'
-                                          )
-                                          . '">' . $attendee->email() . '</a>';
-                                    $this->_template_args['event_attendees'][ $registration->ID() ]['address']
-                                        = EEH_Address::format($attendee, 'inline', false, false);
-                                } else {
-                                    $this->_template_args['event_attendees'][ $registration->ID() ]['att_id'] = '';
-                                    $this->_template_args['event_attendees'][ $registration->ID() ]['attendee'] = '';
-                                    $this->_template_args['event_attendees'][ $registration->ID() ]['email'] = '';
-                                    $this->_template_args['event_attendees'][ $registration->ID() ]['address'] = '';
-                                }
-                            }
-                            break;
-                    }
-                }
-            }
-
-            $this->_template_args['transaction_form_url'] = add_query_arg(
-                array(
-                    'action'  => 'edit_transaction',
-                    'process' => 'attendees',
-                ),
-                TXN_ADMIN_URL
-            );
-            echo EEH_Template::display_template(
-                TXN_TEMPLATE_PATH . 'txn_admin_details_main_meta_box_attendees.template.php',
-                $this->_template_args,
-                true
-            );
-        } else {
-            echo sprintf(
-                esc_html__(
-                    '%1$sFor some reason, there are no attendees registered for this transaction. Likely the registration was abandoned in process.%2$s',
-                    'event_espresso'
-                ),
-                '<p class="important-notice">',
-                '</p>'
-            );
-        }
-    }
-
-
-    /**
-     * txn_registrant_side_meta_box
-     * generates HTML for the Edit Transaction side meta box
-     *
-     * @access public
-     * @return void
-     * @throws DomainException
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     * @throws ReflectionException
-     */
-    public function txn_registrant_side_meta_box()
-    {
-        $primary_att = $this->_transaction->primary_registration() instanceof EE_Registration
-            ? $this->_transaction->primary_registration()->get_first_related('Attendee')
-            : null;
-        if (! $primary_att instanceof EE_Attendee) {
-            $this->_template_args['no_attendee_message'] = esc_html__(
-                'There is no attached contact for this transaction.  The transaction either failed due to an error or was abandoned.',
-                'event_espresso'
-            );
-            $primary_att = EEM_Attendee::instance()->create_default_object();
-        }
-        $this->_template_args['ATT_ID'] = $primary_att->ID();
-        $this->_template_args['prime_reg_fname'] = $primary_att->fname();
-        $this->_template_args['prime_reg_lname'] = $primary_att->lname();
-        $this->_template_args['prime_reg_email'] = $primary_att->email();
-        $this->_template_args['prime_reg_phone'] = $primary_att->phone();
-        $this->_template_args['edit_attendee_url'] = EE_Admin_Page::add_query_args_and_nonce(
-            array(
-                'action' => 'edit_attendee',
-                'post'   => $primary_att->ID(),
-            ),
-            REG_ADMIN_URL
-        );
-        // get formatted address for registrant
-        $this->_template_args['formatted_address'] = EEH_Address::format($primary_att);
-        echo EEH_Template::display_template(
-            TXN_TEMPLATE_PATH . 'txn_admin_details_side_meta_box_registrant.template.php',
-            $this->_template_args,
-            true
-        );
-    }
-
-
-    /**
-     * txn_billing_info_side_meta_box
-     *    generates HTML for the Edit Transaction side meta box
-     *
-     * @access public
-     * @return void
-     * @throws DomainException
-     * @throws EE_Error
-     */
-    public function txn_billing_info_side_meta_box()
-    {
-
-        $this->_template_args['billing_form'] = $this->_transaction->billing_info();
-        $this->_template_args['billing_form_url'] = add_query_arg(
-            array('action' => 'edit_transaction', 'process' => 'billing'),
-            TXN_ADMIN_URL
-        );
-
-        $template_path = TXN_TEMPLATE_PATH . 'txn_admin_details_side_meta_box_billing_info.template.php';
-        echo EEH_Template::display_template($template_path, $this->_template_args, true);/**/
-    }
-
-
-    /**
-     * apply_payments_or_refunds
-     *    registers a payment or refund made towards a transaction
-     *
-     * @access public
-     * @return void
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws ReflectionException
-     * @throws RuntimeException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     */
-    public function apply_payments_or_refunds()
-    {
-        $json_response_data = array('return_data' => false);
-        $valid_data = $this->_validate_payment_request_data();
-        $has_access = EE_Registry::instance()->CAP->current_user_can(
-            'ee_edit_payments',
-            'apply_payment_or_refund_from_registration_details'
-        );
-        if (! empty($valid_data) && $has_access) {
-            $PAY_ID = $valid_data['PAY_ID'];
-            // save  the new payment
-            $payment = $this->_create_payment_from_request_data($valid_data);
-            // get the TXN for this payment
-            $transaction = $payment->transaction();
-            // verify transaction
-            if ($transaction instanceof EE_Transaction) {
-                // calculate_total_payments_and_update_status
-                $this->_process_transaction_payments($transaction);
-                $REG_IDs = $this->_get_REG_IDs_to_apply_payment_to($payment);
-                $this->_remove_existing_registration_payments($payment, $PAY_ID);
-                // apply payment to registrations (if applicable)
-                if (! empty($REG_IDs)) {
-                    $this->_update_registration_payments($transaction, $payment, $REG_IDs);
-                    $this->_maybe_send_notifications();
-                    // now process status changes for the same registrations
-                    $this->_process_registration_status_change($transaction, $REG_IDs);
-                }
-                $this->_maybe_send_notifications($payment);
-                // prepare to render page
-                $json_response_data['return_data'] = $this->_build_payment_json_response($payment, $REG_IDs);
-                do_action(
-                    'AHEE__Transactions_Admin_Page__apply_payments_or_refund__after_recording',
-                    $transaction,
-                    $payment
-                );
-            } else {
-                EE_Error::add_error(
-                    esc_html__(
-                        'A valid Transaction for this payment could not be retrieved.',
-                        'event_espresso'
-                    ),
-                    __FILE__,
-                    __FUNCTION__,
-                    __LINE__
-                );
-            }
-        } else {
-            if ($has_access) {
-                EE_Error::add_error(
-                    esc_html__(
-                        'The payment form data could not be processed. Please try again.',
-                        'event_espresso'
-                    ),
-                    __FILE__,
-                    __FUNCTION__,
-                    __LINE__
-                );
-            } else {
-                EE_Error::add_error(
-                    esc_html__(
-                        'You do not have access to apply payments or refunds to a registration.',
-                        'event_espresso'
-                    ),
-                    __FILE__,
-                    __FUNCTION__,
-                    __LINE__
-                );
-            }
-        }
-        $notices = EE_Error::get_notices(
-            false,
-            false,
-            false
-        );
-        $this->_template_args = array(
-            'data'    => $json_response_data,
-            'error'   => $notices['errors'],
-            'success' => $notices['success'],
-        );
-        $this->_return_json();
-    }
-
-
-    /**
-     * _validate_payment_request_data
-     *
-     * @return array
-     * @throws EE_Error
-     */
-    protected function _validate_payment_request_data()
-    {
-        if (! isset($this->_req_data['txn_admin_payment'])) {
-            return false;
-        }
-        $payment_form = $this->_generate_payment_form_section();
-        try {
-            if ($payment_form->was_submitted()) {
-                $payment_form->receive_form_submission();
-                if (! $payment_form->is_valid()) {
-                    $submission_error_messages = array();
-                    foreach ($payment_form->get_validation_errors_accumulated() as $validation_error) {
-                        if ($validation_error instanceof EE_Validation_Error) {
-                            $submission_error_messages[] = sprintf(
-                                _x('%s : %s', 'Form Section Name : Form Validation Error', 'event_espresso'),
-                                $validation_error->get_form_section()->html_label_text(),
-                                $validation_error->getMessage()
-                            );
-                        }
-                    }
-                    EE_Error::add_error(
-                        implode('<br />', $submission_error_messages),
-                        __FILE__,
-                        __FUNCTION__,
-                        __LINE__
-                    );
-
-                    return array();
-                }
-            }
-        } catch (EE_Error $e) {
-            EE_Error::add_error($e->getMessage(), __FILE__, __FUNCTION__, __LINE__);
-
-            return array();
-        }
-
-        return $payment_form->valid_data();
-    }
-
-
-    /**
-     * _generate_payment_form_section
-     *
-     * @return EE_Form_Section_Proper
-     * @throws EE_Error
-     */
-    protected function _generate_payment_form_section()
-    {
-        return new EE_Form_Section_Proper(
-            array(
-                'name'        => 'txn_admin_payment',
-                'subsections' => array(
-                    'PAY_ID'          => new EE_Text_Input(
-                        array(
-                            'default'               => 0,
-                            'required'              => false,
-                            'html_label_text'       => esc_html__('Payment ID', 'event_espresso'),
-                            'validation_strategies' => array(new EE_Int_Normalization()),
-                        )
-                    ),
-                    'TXN_ID'          => new EE_Text_Input(
-                        array(
-                            'default'               => 0,
-                            'required'              => true,
-                            'html_label_text'       => esc_html__('Transaction ID', 'event_espresso'),
-                            'validation_strategies' => array(new EE_Int_Normalization()),
-                        )
-                    ),
-                    'type'            => new EE_Text_Input(
-                        array(
-                            'default'               => 1,
-                            'required'              => true,
-                            'html_label_text'       => esc_html__('Payment or Refund', 'event_espresso'),
-                            'validation_strategies' => array(new EE_Int_Normalization()),
-                        )
-                    ),
-                    'amount'          => new EE_Text_Input(
-                        array(
-                            'default'               => 0,
-                            'required'              => true,
-                            'html_label_text'       => esc_html__('Payment amount', 'event_espresso'),
-                            'validation_strategies' => array(new EE_Float_Normalization()),
-                        )
-                    ),
-                    'status'          => new EE_Text_Input(
-                        array(
-                            'default'         => EEM_Payment::status_id_approved,
-                            'required'        => true,
-                            'html_label_text' => esc_html__('Payment status', 'event_espresso'),
-                        )
-                    ),
-                    'PMD_ID'          => new EE_Text_Input(
-                        array(
-                            'default'               => 2,
-                            'required'              => true,
-                            'html_label_text'       => esc_html__('Payment Method', 'event_espresso'),
-                            'validation_strategies' => array(new EE_Int_Normalization()),
-                        )
-                    ),
-                    'date'            => new EE_Text_Input(
-                        array(
-                            'default'         => time(),
-                            'required'        => true,
-                            'html_label_text' => esc_html__('Payment date', 'event_espresso'),
-                        )
-                    ),
-                    'txn_id_chq_nmbr' => new EE_Text_Input(
-                        array(
-                            'default'               => '',
-                            'required'              => false,
-                            'html_label_text'       => esc_html__('Transaction or Cheque Number', 'event_espresso'),
-                            'validation_strategies' => array(
-                                new EE_Max_Length_Validation_Strategy(
-                                    esc_html__('Input too long', 'event_espresso'),
-                                    100
-                                ),
-                            ),
-                        )
-                    ),
-                    'po_number'       => new EE_Text_Input(
-                        array(
-                            'default'               => '',
-                            'required'              => false,
-                            'html_label_text'       => esc_html__('Purchase Order Number', 'event_espresso'),
-                            'validation_strategies' => array(
-                                new EE_Max_Length_Validation_Strategy(
-                                    esc_html__('Input too long', 'event_espresso'),
-                                    100
-                                ),
-                            ),
-                        )
-                    ),
-                    'accounting'      => new EE_Text_Input(
-                        array(
-                            'default'               => '',
-                            'required'              => false,
-                            'html_label_text'       => esc_html__('Extra Field for Accounting', 'event_espresso'),
-                            'validation_strategies' => array(
-                                new EE_Max_Length_Validation_Strategy(
-                                    esc_html__('Input too long', 'event_espresso'),
-                                    100
-                                ),
-                            ),
-                        )
-                    ),
-                ),
-            )
-        );
-    }
-
-
-    /**
-     * _create_payment_from_request_data
-     *
-     * @param array $valid_data
-     * @return EE_Payment
-     * @throws EE_Error
-     */
-    protected function _create_payment_from_request_data($valid_data)
-    {
-        $PAY_ID = $valid_data['PAY_ID'];
-        // get payment amount
-        $amount = $valid_data['amount'] ? abs($valid_data['amount']) : 0;
-        // payments have a type value of 1 and refunds have a type value of -1
-        // so multiplying amount by type will give a positive value for payments, and negative values for refunds
-        $amount = $valid_data['type'] < 0 ? $amount * -1 : $amount;
-        // for some reason the date string coming in has extra spaces between the date and time.  This fixes that.
-        $date = $valid_data['date']
-            ? preg_replace('/\s+/', ' ', $valid_data['date'])
-            : date('Y-m-d g:i a', current_time('timestamp'));
-        $payment = EE_Payment::new_instance(
-            array(
-                'TXN_ID'              => $valid_data['TXN_ID'],
-                'STS_ID'              => $valid_data['status'],
-                'PAY_timestamp'       => $date,
-                'PAY_source'          => EEM_Payment_Method::scope_admin,
-                'PMD_ID'              => $valid_data['PMD_ID'],
-                'PAY_amount'          => $amount,
-                'PAY_txn_id_chq_nmbr' => $valid_data['txn_id_chq_nmbr'],
-                'PAY_po_number'       => $valid_data['po_number'],
-                'PAY_extra_accntng'   => $valid_data['accounting'],
-                'PAY_details'         => $valid_data,
-                'PAY_ID'              => $PAY_ID,
-            ),
-            '',
-            array('Y-m-d', 'g:i a')
-        );
-
-        if (! $payment->save()) {
-            EE_Error::add_error(
-                sprintf(
-                    esc_html__('Payment %1$d has not been successfully saved to the database.', 'event_espresso'),
-                    $payment->ID()
-                ),
-                __FILE__,
-                __FUNCTION__,
-                __LINE__
-            );
-        }
-
-        return $payment;
-    }
-
-
-    /**
-     * _process_transaction_payments
-     *
-     * @param \EE_Transaction $transaction
-     * @return void
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws ReflectionException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     */
-    protected function _process_transaction_payments(EE_Transaction $transaction)
-    {
-        /** @type EE_Transaction_Payments $transaction_payments */
-        $transaction_payments = EE_Registry::instance()->load_class('Transaction_Payments');
-        // update the transaction with this payment
-        if ($transaction_payments->calculate_total_payments_and_update_status($transaction)) {
-            EE_Error::add_success(
-                esc_html__(
-                    'The payment has been processed successfully.',
-                    'event_espresso'
-                ),
-                __FILE__,
-                __FUNCTION__,
-                __LINE__
-            );
-        } else {
-            EE_Error::add_error(
-                esc_html__(
-                    'The payment was processed successfully but the amount paid for the transaction was not updated.',
-                    'event_espresso'
-                ),
-                __FILE__,
-                __FUNCTION__,
-                __LINE__
-            );
-        }
-    }
-
-
-    /**
-     * _get_REG_IDs_to_apply_payment_to
-     * returns a list of registration IDs that the payment will apply to
-     *
-     * @param \EE_Payment $payment
-     * @return array
-     * @throws EE_Error
-     */
-    protected function _get_REG_IDs_to_apply_payment_to(EE_Payment $payment)
-    {
-        $REG_IDs = array();
-        // grab array of IDs for specific registrations to apply changes to
-        if (isset($this->_req_data['txn_admin_payment']['registrations'])) {
-            $REG_IDs = (array) $this->_req_data['txn_admin_payment']['registrations'];
-        }
-        // nothing specified ? then get all reg IDs
-        if (empty($REG_IDs)) {
-            $registrations = $payment->transaction()->registrations();
-            $REG_IDs = ! empty($registrations)
-                ? array_keys($registrations)
-                : $this->_get_existing_reg_payment_REG_IDs($payment);
-        }
-
-        // ensure that REG_IDs are integers and NOT strings
-        return array_map('intval', $REG_IDs);
-    }
-
-
-    /**
-     * @return array
-     */
-    public function existing_reg_payment_REG_IDs()
-    {
-        return $this->_existing_reg_payment_REG_IDs;
-    }
-
-
-    /**
-     * @param array $existing_reg_payment_REG_IDs
-     */
-    public function set_existing_reg_payment_REG_IDs($existing_reg_payment_REG_IDs = null)
-    {
-        $this->_existing_reg_payment_REG_IDs = $existing_reg_payment_REG_IDs;
-    }
-
-
-    /**
-     * _get_existing_reg_payment_REG_IDs
-     * returns a list of registration IDs that the payment is currently related to
-     * as recorded in the database
-     *
-     * @param \EE_Payment $payment
-     * @return array
-     * @throws EE_Error
-     */
-    protected function _get_existing_reg_payment_REG_IDs(EE_Payment $payment)
-    {
-        if ($this->existing_reg_payment_REG_IDs() === null) {
-            // let's get any existing reg payment records for this payment
-            $existing_reg_payment_REG_IDs = $payment->get_many_related('Registration');
-            // but we only want the REG IDs, so grab the array keys
-            $existing_reg_payment_REG_IDs = ! empty($existing_reg_payment_REG_IDs)
-                ? array_keys($existing_reg_payment_REG_IDs)
-                : array();
-            $this->set_existing_reg_payment_REG_IDs($existing_reg_payment_REG_IDs);
-        }
-
-        return $this->existing_reg_payment_REG_IDs();
-    }
-
-
-    /**
-     * _remove_existing_registration_payments
-     * this calculates the difference between existing relations
-     * to the supplied payment and the new list registration IDs,
-     * removes any related registrations that no longer apply,
-     * and then updates the registration paid fields
-     *
-     * @param \EE_Payment $payment
-     * @param int         $PAY_ID
-     * @return bool;
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws ReflectionException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     */
-    protected function _remove_existing_registration_payments(EE_Payment $payment, $PAY_ID = 0)
-    {
-        // newly created payments will have nothing recorded for $PAY_ID
-        if ($PAY_ID == 0) {
-            return false;
-        }
-        $existing_reg_payment_REG_IDs = $this->_get_existing_reg_payment_REG_IDs($payment);
-        if (empty($existing_reg_payment_REG_IDs)) {
-            return false;
-        }
-        /** @type EE_Transaction_Payments $transaction_payments */
-        $transaction_payments = EE_Registry::instance()->load_class('Transaction_Payments');
-
-        return $transaction_payments->delete_registration_payments_and_update_registrations(
-            $payment,
-            array(
-                array(
-                    'PAY_ID' => $payment->ID(),
-                    'REG_ID' => array('IN', $existing_reg_payment_REG_IDs),
-                ),
-            )
-        );
-    }
-
-
-    /**
-     * _update_registration_payments
-     * this applies the payments to the selected registrations
-     * but only if they have not already been paid for
-     *
-     * @param  EE_Transaction $transaction
-     * @param \EE_Payment     $payment
-     * @param array           $REG_IDs
-     * @return void
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws ReflectionException
-     * @throws RuntimeException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     */
-    protected function _update_registration_payments(
-        EE_Transaction $transaction,
-        EE_Payment $payment,
-        $REG_IDs = array()
-    ) {
-        // we can pass our own custom set of registrations to EE_Payment_Processor::process_registration_payments()
-        // so let's do that using our set of REG_IDs from the form
-        $registration_query_where_params = array(
-            'REG_ID' => array('IN', $REG_IDs),
-        );
-        // but add in some conditions regarding payment,
-        // so that we don't apply payments to registrations that are free or have already been paid for
-        // but ONLY if the payment is NOT a refund ( ie: the payment amount is not negative )
-        if (! $payment->is_a_refund()) {
-            $registration_query_where_params['REG_final_price'] = array('!=', 0);
-            $registration_query_where_params['REG_final_price*'] = array('!=', 'REG_paid', true);
-        }
-        $registrations = $transaction->registrations(array($registration_query_where_params));
-        if (! empty($registrations)) {
-            /** @type EE_Payment_Processor $payment_processor */
-            $payment_processor = EE_Registry::instance()->load_core('Payment_Processor');
-            $payment_processor->process_registration_payments($transaction, $payment, $registrations);
-        }
-    }
-
-
-    /**
-     * _process_registration_status_change
-     * This processes requested registration status changes for all the registrations
-     * on a given transaction and (optionally) sends out notifications for the changes.
-     *
-     * @param  EE_Transaction $transaction
-     * @param array           $REG_IDs
-     * @return bool
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws ReflectionException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     */
-    protected function _process_registration_status_change(EE_Transaction $transaction, $REG_IDs = array())
-    {
-        // first if there is no change in status then we get out.
-        if (! isset($this->_req_data['txn_reg_status_change']['reg_status'])
-            || $this->_req_data['txn_reg_status_change']['reg_status'] === 'NAN'
-        ) {
-            // no error message, no change requested, just nothing to do man.
-            return false;
-        }
-        /** @type EE_Transaction_Processor $transaction_processor */
-        $transaction_processor = EE_Registry::instance()->load_class('Transaction_Processor');
-
-        // made it here dude?  Oh WOW.  K, let's take care of changing the statuses
-        return $transaction_processor->manually_update_registration_statuses(
-            $transaction,
-            sanitize_text_field($this->_req_data['txn_reg_status_change']['reg_status']),
-            array(array('REG_ID' => array('IN', $REG_IDs)))
-        );
-    }
-
-
-    /**
-     * _build_payment_json_response
-     *
-     * @access public
-     * @param \EE_Payment $payment
-     * @param array       $REG_IDs
-     * @param bool | null $delete_txn_reg_status_change
-     * @return array
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     * @throws ReflectionException
-     */
-    protected function _build_payment_json_response(
-        EE_Payment $payment,
-        $REG_IDs = array(),
-        $delete_txn_reg_status_change = null
-    ) {
-        // was the payment deleted ?
-        if (is_bool($delete_txn_reg_status_change)) {
-            return array(
-                'PAY_ID'                       => $payment->ID(),
-                'amount'                       => $payment->amount(),
-                'total_paid'                   => $payment->transaction()->paid(),
-                'txn_status'                   => $payment->transaction()->status_ID(),
-                'pay_status'                   => $payment->STS_ID(),
-                'registrations'                => $this->_registration_payment_data_array($REG_IDs),
-                'delete_txn_reg_status_change' => $delete_txn_reg_status_change,
-            );
-        } else {
-            $this->_get_payment_status_array();
-
-            return array(
-                'amount'           => $payment->amount(),
-                'total_paid'       => $payment->transaction()->paid(),
-                'txn_status'       => $payment->transaction()->status_ID(),
-                'pay_status'       => $payment->STS_ID(),
-                'PAY_ID'           => $payment->ID(),
-                'STS_ID'           => $payment->STS_ID(),
-                'status'           => self::$_pay_status[ $payment->STS_ID() ],
-                'date'             => $payment->timestamp('Y-m-d', 'h:i a'),
-                'method'           => strtoupper($payment->source()),
-                'PM_ID'            => $payment->payment_method() ? $payment->payment_method()->ID() : 1,
-                'gateway'          => $payment->payment_method()
-                    ? $payment->payment_method()->admin_name()
-                    : esc_html__("Unknown", 'event_espresso'),
-                'gateway_response' => $payment->gateway_response(),
-                'txn_id_chq_nmbr'  => $payment->txn_id_chq_nmbr(),
-                'po_number'        => $payment->po_number(),
-                'extra_accntng'    => $payment->extra_accntng(),
-                'registrations'    => $this->_registration_payment_data_array($REG_IDs),
-            );
-        }
-    }
-
-
-    /**
-     * delete_payment
-     *    delete a payment or refund made towards a transaction
-     *
-     * @access public
-     * @return void
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws ReflectionException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     */
-    public function delete_payment()
-    {
-        $json_response_data = array('return_data' => false);
-        $PAY_ID = isset($this->_req_data['delete_txn_admin_payment']['PAY_ID'])
-            ? absint($this->_req_data['delete_txn_admin_payment']['PAY_ID'])
-            : 0;
-        $can_delete = EE_Registry::instance()->CAP->current_user_can(
-            'ee_delete_payments',
-            'delete_payment_from_registration_details'
-        );
-        if ($PAY_ID && $can_delete) {
-            $delete_txn_reg_status_change = isset($this->_req_data['delete_txn_reg_status_change'])
-                ? $this->_req_data['delete_txn_reg_status_change']
-                : false;
-            $payment = EEM_Payment::instance()->get_one_by_ID($PAY_ID);
-            if ($payment instanceof EE_Payment) {
-                $REG_IDs = $this->_get_existing_reg_payment_REG_IDs($payment);
-                /** @type EE_Transaction_Payments $transaction_payments */
-                $transaction_payments = EE_Registry::instance()->load_class('Transaction_Payments');
-                if ($transaction_payments->delete_payment_and_update_transaction($payment)) {
-                    $json_response_data['return_data'] = $this->_build_payment_json_response(
-                        $payment,
-                        $REG_IDs,
-                        $delete_txn_reg_status_change
-                    );
-                    if ($delete_txn_reg_status_change) {
-                        $this->_req_data['txn_reg_status_change'] = $delete_txn_reg_status_change;
-                        // MAKE sure we also add the delete_txn_req_status_change to the
-                        // $_REQUEST global because that's how messages will be looking for it.
-                        $_REQUEST['txn_reg_status_change'] = $delete_txn_reg_status_change;
-                        $this->_maybe_send_notifications();
-                        $this->_process_registration_status_change($payment->transaction(), $REG_IDs);
-                    }
-                }
-            } else {
-                EE_Error::add_error(
-                    esc_html__('Valid Payment data could not be retrieved from the database.', 'event_espresso'),
-                    __FILE__,
-                    __FUNCTION__,
-                    __LINE__
-                );
-            }
-        } else {
-            if ($can_delete) {
-                EE_Error::add_error(
-                    esc_html__(
-                        'A valid Payment ID was not received, therefore payment form data could not be loaded.',
-                        'event_espresso'
-                    ),
-                    __FILE__,
-                    __FUNCTION__,
-                    __LINE__
-                );
-            } else {
-                EE_Error::add_error(
-                    esc_html__(
-                        'You do not have access to delete a payment.',
-                        'event_espresso'
-                    ),
-                    __FILE__,
-                    __FUNCTION__,
-                    __LINE__
-                );
-            }
-        }
-        $notices = EE_Error::get_notices(false, false, false);
-        $this->_template_args = array(
-            'data'      => $json_response_data,
-            'success'   => $notices['success'],
-            'error'     => $notices['errors'],
-            'attention' => $notices['attention'],
-        );
-        $this->_return_json();
-    }
-
-
-    /**
-     * _registration_payment_data_array
-     * adds info for 'owing' and 'paid' for each registration to the json response
-     *
-     * @access protected
-     * @param array $REG_IDs
-     * @return array
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     * @throws ReflectionException
-     */
-    protected function _registration_payment_data_array($REG_IDs)
-    {
-        $registration_payment_data = array();
-        // if non empty reg_ids lets get an array of registrations and update the values for the apply_payment/refund rows.
-        if (! empty($REG_IDs)) {
-            $registrations = EEM_Registration::instance()->get_all(array(array('REG_ID' => array('IN', $REG_IDs))));
-            foreach ($registrations as $registration) {
-                if ($registration instanceof EE_Registration) {
-                    $registration_payment_data[ $registration->ID() ] = array(
-                        'paid'  => $registration->pretty_paid(),
-                        'owing' => EEH_Template::format_currency($registration->final_price() - $registration->paid()),
-                    );
-                }
-            }
-        }
-
-        return $registration_payment_data;
-    }
-
-
-    /**
-     * _maybe_send_notifications
-     * determines whether or not the admin has indicated that notifications should be sent.
-     * If so, will toggle a filter switch for delivering registration notices.
-     * If passed an EE_Payment object, then it will trigger payment notifications instead.
-     *
-     * @access protected
-     * @param \EE_Payment | null $payment
-     */
-    protected function _maybe_send_notifications($payment = null)
-    {
-        switch ($payment instanceof EE_Payment) {
-            // payment notifications
-            case true:
-                if (isset(
-                    $this->_req_data['txn_payments'],
-                    $this->_req_data['txn_payments']['send_notifications']
-                )
-                    && filter_var($this->_req_data['txn_payments']['send_notifications'], FILTER_VALIDATE_BOOLEAN)
-                ) {
-                    $this->_process_payment_notification($payment);
-                }
-                break;
-            // registration notifications
-            case false:
-                if (isset(
-                    $this->_req_data['txn_reg_status_change'],
-                    $this->_req_data['txn_reg_status_change']['send_notifications']
-                )
-                    && filter_var($this->_req_data['txn_reg_status_change']['send_notifications'], FILTER_VALIDATE_BOOLEAN)
-                ) {
-                    add_filter('FHEE__EED_Messages___maybe_registration__deliver_notifications', '__return_true');
-                }
-                break;
-        }
-    }
-
-
-    /**
-     * _send_payment_reminder
-     *    generates HTML for the View Transaction Details Admin page
-     *
-     * @access protected
-     * @return void
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     */
-    protected function _send_payment_reminder()
-    {
-        $TXN_ID = ! empty($this->_req_data['TXN_ID']) ? absint($this->_req_data['TXN_ID']) : false;
-        $transaction = EEM_Transaction::instance()->get_one_by_ID($TXN_ID);
-        $query_args = isset($this->_req_data['redirect_to']) ? array(
-            'action' => $this->_req_data['redirect_to'],
-            'TXN_ID' => $this->_req_data['TXN_ID'],
-        ) : array();
-        do_action(
-            'AHEE__Transactions_Admin_Page___send_payment_reminder__process_admin_payment_reminder',
-            $transaction
-        );
-        $this->_redirect_after_action(
-            false,
-            esc_html__('payment reminder', 'event_espresso'),
-            esc_html__('sent', 'event_espresso'),
-            $query_args,
-            true
-        );
-    }
-
-
-    /**
-     *  get_transactions
-     *    get transactions for given parameters (used by list table)
-     *
-     * @param  int     $perpage how many transactions displayed per page
-     * @param  boolean $count   return the count or objects
-     * @param string   $view
-     * @return mixed int = count || array of transaction objects
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     */
-    public function get_transactions($perpage, $count = false, $view = '')
-    {
-
-        $TXN = EEM_Transaction::instance();
-
-        $start_date = isset($this->_req_data['txn-filter-start-date'])
-            ? wp_strip_all_tags($this->_req_data['txn-filter-start-date'])
-            : date(
-                'm/d/Y',
-                strtotime('-10 year')
-            );
-        $end_date = isset($this->_req_data['txn-filter-end-date'])
-            ? wp_strip_all_tags($this->_req_data['txn-filter-end-date'])
-            : date('m/d/Y');
-
-        // make sure our timestamps start and end right at the boundaries for each day
-        $start_date = date('Y-m-d', strtotime($start_date)) . ' 00:00:00';
-        $end_date = date('Y-m-d', strtotime($end_date)) . ' 23:59:59';
-
-
-        // convert to timestamps
-        $start_date = strtotime($start_date);
-        $end_date = strtotime($end_date);
-
-        // makes sure start date is the lowest value and vice versa
-        $start_date = min($start_date, $end_date);
-        $end_date = max($start_date, $end_date);
-
-        // convert to correct format for query
-        $start_date = EEM_Transaction::instance()->convert_datetime_for_query(
-            'TXN_timestamp',
-            date('Y-m-d H:i:s', $start_date),
-            'Y-m-d H:i:s'
-        );
-        $end_date = EEM_Transaction::instance()->convert_datetime_for_query(
-            'TXN_timestamp',
-            date('Y-m-d H:i:s', $end_date),
-            'Y-m-d H:i:s'
-        );
-
-
-        // set orderby
-        $this->_req_data['orderby'] = ! empty($this->_req_data['orderby']) ? $this->_req_data['orderby'] : '';
-
-        switch ($this->_req_data['orderby']) {
-            case 'TXN_ID':
-                $orderby = 'TXN_ID';
-                break;
-            case 'ATT_fname':
-                $orderby = 'Registration.Attendee.ATT_fname';
-                break;
-            case 'event_name':
-                $orderby = 'Registration.Event.EVT_name';
-                break;
-            default: // 'TXN_timestamp'
-                $orderby = 'TXN_timestamp';
-        }
-
-        $sort = ! empty($this->_req_data['order']) ? $this->_req_data['order'] : 'DESC';
-        $current_page = ! empty($this->_req_data['paged']) ? $this->_req_data['paged'] : 1;
-        $per_page = ! empty($perpage) ? $perpage : 10;
-        $per_page = ! empty($this->_req_data['perpage']) ? $this->_req_data['perpage'] : $per_page;
-
-        $offset = ($current_page - 1) * $per_page;
-        $limit = array($offset, $per_page);
-
-        $_where = array(
-            'TXN_timestamp'          => array('BETWEEN', array($start_date, $end_date)),
-            'Registration.REG_count' => 1,
-        );
-
-        if (isset($this->_req_data['EVT_ID'])) {
-            $_where['Registration.EVT_ID'] = $this->_req_data['EVT_ID'];
-        }
-
-        if (isset($this->_req_data['s'])) {
-            $search_string = '%' . $this->_req_data['s'] . '%';
-            $_where['OR'] = array(
-                'Registration.Event.EVT_name'         => array('LIKE', $search_string),
-                'Registration.Event.EVT_desc'         => array('LIKE', $search_string),
-                'Registration.Event.EVT_short_desc'   => array('LIKE', $search_string),
-                'Registration.Attendee.ATT_full_name' => array('LIKE', $search_string),
-                'Registration.Attendee.ATT_fname'     => array('LIKE', $search_string),
-                'Registration.Attendee.ATT_lname'     => array('LIKE', $search_string),
-                'Registration.Attendee.ATT_short_bio' => array('LIKE', $search_string),
-                'Registration.Attendee.ATT_email'     => array('LIKE', $search_string),
-                'Registration.Attendee.ATT_address'   => array('LIKE', $search_string),
-                'Registration.Attendee.ATT_address2'  => array('LIKE', $search_string),
-                'Registration.Attendee.ATT_city'      => array('LIKE', $search_string),
-                'Registration.REG_final_price'        => array('LIKE', $search_string),
-                'Registration.REG_code'               => array('LIKE', $search_string),
-                'Registration.REG_count'              => array('LIKE', $search_string),
-                'Registration.REG_group_size'         => array('LIKE', $search_string),
-                'Registration.Ticket.TKT_name'        => array('LIKE', $search_string),
-                'Registration.Ticket.TKT_description' => array('LIKE', $search_string),
-                'Payment.PAY_source'                  => array('LIKE', $search_string),
-                'Payment.Payment_Method.PMD_name'     => array('LIKE', $search_string),
-                'TXN_session_data'                    => array('LIKE', $search_string),
-                'Payment.PAY_txn_id_chq_nmbr'         => array('LIKE', $search_string),
-            );
-        }
-
-        // failed transactions
-        $failed = (! empty($this->_req_data['status']) && $this->_req_data['status'] === 'failed' && ! $count)
-                  || ($count && $view === 'failed');
-        $abandoned = (! empty($this->_req_data['status']) && $this->_req_data['status'] === 'abandoned' && ! $count)
-                     || ($count && $view === 'abandoned');
-        $incomplete = (! empty($this->_req_data['status']) && $this->_req_data['status'] === 'incomplete' && ! $count)
-                      || ($count && $view === 'incomplete');
-
-        if ($failed) {
-            $_where['STS_ID'] = EEM_Transaction::failed_status_code;
-        } elseif ($abandoned) {
-            $_where['STS_ID'] = EEM_Transaction::abandoned_status_code;
-        } elseif ($incomplete) {
-            $_where['STS_ID'] = EEM_Transaction::incomplete_status_code;
-        } else {
-            $_where['STS_ID'] = array('!=', EEM_Transaction::failed_status_code);
-            $_where['STS_ID*'] = array('!=', EEM_Transaction::abandoned_status_code);
-        }
-
-        $query_params = apply_filters(
-            'FHEE__Transactions_Admin_Page___get_transactions_query_params',
-            array(
-                $_where,
-                'order_by'                 => array($orderby => $sort),
-                'limit'                    => $limit,
-                'default_where_conditions' => EEM_Base::default_where_conditions_this_only,
-            ),
-            $this->_req_data,
-            $view,
-            $count
-        );
-
-        $transactions = $count
-            ? $TXN->count(array($query_params[0]), 'TXN_ID', true)
-            : $TXN->get_all($query_params);
-
-        return $transactions;
-    }
-
-
-    /**
-     * @since $VID:$
-     * @throws EE_Error
-     * @throws InvalidArgumentException
-     * @throws InvalidDataTypeException
-     * @throws InvalidInterfaceException
-     */
-    public function recalculateLineItems()
-    {
-        $TXN_ID = ! empty($this->_req_data['TXN_ID']) ? absint($this->_req_data['TXN_ID']) : false;
-        /** @var EE_Transaction $transaction */
-        $transaction = EEM_Transaction::instance()->get_one_by_ID($TXN_ID);
-        $total_line_item = $transaction->total_line_item(false);
-        if ($total_line_item instanceof EE_Line_Item) {
-            EEH_Line_Item::apply_taxes($total_line_item);
-        }
-        $this->_redirect_after_action(
-            false,
-            esc_html__('Transaction taxes and totals', 'event_espresso'),
-            esc_html__('recalculated', 'event_espresso'),
-            isset($this->_req_data['redirect_to'])
-                ? array(
-                'action' => $this->_req_data['redirect_to'],
-                'TXN_ID' => $this->_req_data['TXN_ID'],
-            )
-                : array(),
-            true
-        );
-    }
+	/**
+	 * @var EE_Transaction
+	 */
+	private $_transaction;
+
+	/**
+	 * @var EE_Session
+	 */
+	private $_session;
+
+	/**
+	 * @var array $_txn_status
+	 */
+	private static $_txn_status;
+
+	/**
+	 * @var array $_pay_status
+	 */
+	private static $_pay_status;
+
+	/**
+	 * @var array $_existing_reg_payment_REG_IDs
+	 */
+	protected $_existing_reg_payment_REG_IDs = null;
+
+
+	/**
+	 * @Constructor
+	 * @access public
+	 * @param bool $routing
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws ReflectionException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 */
+	public function __construct($routing = true)
+	{
+		parent::__construct($routing);
+	}
+
+
+	/**
+	 *    _init_page_props
+	 *
+	 * @return void
+	 */
+	protected function _init_page_props()
+	{
+		$this->page_slug = TXN_PG_SLUG;
+		$this->page_label = esc_html__('Transactions', 'event_espresso');
+		$this->_admin_base_url = TXN_ADMIN_URL;
+		$this->_admin_base_path = TXN_ADMIN;
+	}
+
+
+	/**
+	 *    _ajax_hooks
+	 *
+	 * @return void
+	 */
+	protected function _ajax_hooks()
+	{
+		add_action('wp_ajax_espresso_apply_payment', array($this, 'apply_payments_or_refunds'));
+		add_action('wp_ajax_espresso_apply_refund', array($this, 'apply_payments_or_refunds'));
+		add_action('wp_ajax_espresso_delete_payment', array($this, 'delete_payment'));
+	}
+
+
+	/**
+	 *    _define_page_props
+	 *
+	 * @return void
+	 */
+	protected function _define_page_props()
+	{
+		$this->_admin_page_title = $this->page_label;
+		$this->_labels = array(
+			'buttons' => array(
+				'add'    => esc_html__('Add New Transaction', 'event_espresso'),
+				'edit'   => esc_html__('Edit Transaction', 'event_espresso'),
+				'delete' => esc_html__('Delete Transaction', 'event_espresso'),
+			),
+		);
+	}
+
+
+	/**
+	 *        grab url requests and route them
+	 *
+	 * @access private
+	 * @return void
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 */
+	public function _set_page_routes()
+	{
+
+		$this->_set_transaction_status_array();
+
+		$txn_id = ! empty($this->_req_data['TXN_ID'])
+				  && ! is_array($this->_req_data['TXN_ID'])
+			? $this->_req_data['TXN_ID']
+			: 0;
+
+		$this->_page_routes = array(
+
+			'default' => array(
+				'func'       => '_transactions_overview_list_table',
+				'capability' => 'ee_read_transactions',
+			),
+
+			'view_transaction' => array(
+				'func'       => '_transaction_details',
+				'capability' => 'ee_read_transaction',
+				'obj_id'     => $txn_id,
+			),
+
+			'send_payment_reminder' => array(
+				'func'       => '_send_payment_reminder',
+				'noheader'   => true,
+				'capability' => 'ee_send_message',
+			),
+
+			'espresso_apply_payment' => array(
+				'func'       => 'apply_payments_or_refunds',
+				'noheader'   => true,
+				'capability' => 'ee_edit_payments',
+			),
+
+			'espresso_apply_refund' => array(
+				'func'       => 'apply_payments_or_refunds',
+				'noheader'   => true,
+				'capability' => 'ee_edit_payments',
+			),
+
+			'espresso_delete_payment' => array(
+				'func'       => 'delete_payment',
+				'noheader'   => true,
+				'capability' => 'ee_delete_payments',
+			),
+
+			'espresso_recalculate_line_items' => array(
+				'func'       => 'recalculateLineItems',
+				'noheader'   => true,
+				'capability' => 'ee_edit_payments',
+			),
+
+		);
+	}
+
+
+	protected function _set_page_config()
+	{
+		$this->_page_config = array(
+			'default'          => array(
+				'nav'           => array(
+					'label' => esc_html__('Overview', 'event_espresso'),
+					'order' => 10,
+				),
+				'list_table'    => 'EE_Admin_Transactions_List_Table',
+				'help_tabs'     => array(
+					'transactions_overview_help_tab'                       => array(
+						'title'    => esc_html__('Transactions Overview', 'event_espresso'),
+						'filename' => 'transactions_overview',
+					),
+					'transactions_overview_table_column_headings_help_tab' => array(
+						'title'    => esc_html__('Transactions Table Column Headings', 'event_espresso'),
+						'filename' => 'transactions_overview_table_column_headings',
+					),
+					'transactions_overview_views_filters_help_tab'         => array(
+						'title'    => esc_html__('Transaction Views & Filters & Search', 'event_espresso'),
+						'filename' => 'transactions_overview_views_filters_search',
+					),
+				),
+				'help_tour'     => array('Transactions_Overview_Help_Tour'),
+				/**
+				 * commented out because currently we are not displaying tips for transaction list table status but this
+				 * may change in a later iteration so want to keep the code for then.
+				 */
+				// 'qtips' => array( 'Transactions_List_Table_Tips' ),
+				'require_nonce' => false,
+			),
+			'view_transaction' => array(
+				'nav'       => array(
+					'label'      => esc_html__('View Transaction', 'event_espresso'),
+					'order'      => 5,
+					'url'        => isset($this->_req_data['TXN_ID'])
+						? add_query_arg(array('TXN_ID' => $this->_req_data['TXN_ID']), $this->_current_page_view_url)
+						: $this->_admin_base_url,
+					'persistent' => false,
+				),
+				'help_tabs' => array(
+					'transactions_view_transaction_help_tab'                                              => array(
+						'title'    => esc_html__('View Transaction', 'event_espresso'),
+						'filename' => 'transactions_view_transaction',
+					),
+					'transactions_view_transaction_transaction_details_table_help_tab'                    => array(
+						'title'    => esc_html__('Transaction Details Table', 'event_espresso'),
+						'filename' => 'transactions_view_transaction_transaction_details_table',
+					),
+					'transactions_view_transaction_attendees_registered_help_tab'                         => array(
+						'title'    => esc_html__('Attendees Registered', 'event_espresso'),
+						'filename' => 'transactions_view_transaction_attendees_registered',
+					),
+					'transactions_view_transaction_views_primary_registrant_billing_information_help_tab' => array(
+						'title'    => esc_html__('Primary Registrant & Billing Information', 'event_espresso'),
+						'filename' => 'transactions_view_transaction_primary_registrant_billing_information',
+					),
+				),
+				'qtips'     => array('Transaction_Details_Tips'),
+				'help_tour' => array('Transaction_Details_Help_Tour'),
+				'metaboxes' => array('_transaction_details_metaboxes'),
+
+				'require_nonce' => false,
+			),
+		);
+	}
+
+
+	/**
+	 * The below methods aren't used by this class currently
+	 */
+	protected function _add_screen_options()
+	{
+		// noop
+	}
+
+	protected function _add_feature_pointers()
+	{
+		// noop
+	}
+
+	public function admin_init()
+	{
+		// IF a registration was JUST added via the admin...
+		if (isset(
+			$this->_req_data['redirect_from'],
+			$this->_req_data['EVT_ID'],
+			$this->_req_data['event_name']
+		)) {
+			// then set a cookie so that we can block any attempts to use
+			// the back button as a way to enter another registration.
+			setcookie(
+				'ee_registration_added',
+				$this->_req_data['EVT_ID'],
+				time() + WEEK_IN_SECONDS,
+				'/'
+			);
+			// and update the global
+			$_COOKIE['ee_registration_added'] = $this->_req_data['EVT_ID'];
+		}
+		EE_Registry::$i18n_js_strings['invalid_server_response'] = esc_html__(
+			'An error occurred! Your request may have been processed, but a valid response from the server was not received. Please refresh the page and try again.',
+			'event_espresso'
+		);
+		EE_Registry::$i18n_js_strings['error_occurred'] = esc_html__(
+			'An error occurred! Please refresh the page and try again.',
+			'event_espresso'
+		);
+		EE_Registry::$i18n_js_strings['txn_status_array'] = self::$_txn_status;
+		EE_Registry::$i18n_js_strings['pay_status_array'] = self::$_pay_status;
+		EE_Registry::$i18n_js_strings['payments_total'] = esc_html__('Payments Total', 'event_espresso');
+		EE_Registry::$i18n_js_strings['transaction_overpaid'] = esc_html__(
+			'This transaction has been overpaid ! Payments Total',
+			'event_espresso'
+		);
+	}
+
+	public function admin_notices()
+	{
+		// noop
+	}
+
+	public function admin_footer_scripts()
+	{
+		// noop
+	}
+
+
+	/**
+	 * _set_transaction_status_array
+	 * sets list of transaction statuses
+	 *
+	 * @access private
+	 * @return void
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 */
+	private function _set_transaction_status_array()
+	{
+		self::$_txn_status = EEM_Transaction::instance()->status_array(true);
+	}
+
+
+	/**
+	 * get_transaction_status_array
+	 * return the transaction status array for wp_list_table
+	 *
+	 * @access public
+	 * @return array
+	 */
+	public function get_transaction_status_array()
+	{
+		return self::$_txn_status;
+	}
+
+
+	/**
+	 *    get list of payment statuses
+	 *
+	 * @access private
+	 * @return void
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 */
+	private function _get_payment_status_array()
+	{
+		self::$_pay_status = EEM_Payment::instance()->status_array(true);
+		$this->_template_args['payment_status'] = self::$_pay_status;
+	}
+
+
+	/**
+	 *    _add_screen_options_default
+	 *
+	 * @access protected
+	 * @return void
+	 * @throws InvalidArgumentException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 */
+	protected function _add_screen_options_default()
+	{
+		$this->_per_page_screen_option();
+	}
+
+
+	/**
+	 * load_scripts_styles
+	 *
+	 * @access public
+	 * @return void
+	 */
+	public function load_scripts_styles()
+	{
+		// enqueue style
+		wp_register_style(
+			'espresso_txn',
+			TXN_ASSETS_URL . 'espresso_transactions_admin.css',
+			array(),
+			EVENT_ESPRESSO_VERSION
+		);
+		wp_enqueue_style('espresso_txn');
+		// scripts
+		wp_register_script(
+			'espresso_txn',
+			TXN_ASSETS_URL . 'espresso_transactions_admin.js',
+			array(
+				'ee_admin_js',
+				'ee-datepicker',
+				'jquery-ui-datepicker',
+				'jquery-ui-draggable',
+				'ee-dialog',
+				'ee-accounting',
+				'ee-serialize-full-array',
+			),
+			EVENT_ESPRESSO_VERSION,
+			true
+		);
+		wp_enqueue_script('espresso_txn');
+	}
+
+
+	/**
+	 *    load_scripts_styles_view_transaction
+	 *
+	 * @access public
+	 * @return void
+	 */
+	public function load_scripts_styles_view_transaction()
+	{
+		// styles
+		wp_enqueue_style('espresso-ui-theme');
+	}
+
+
+	/**
+	 *    load_scripts_styles_default
+	 *
+	 * @access public
+	 * @return void
+	 */
+	public function load_scripts_styles_default()
+	{
+		// styles
+		wp_enqueue_style('espresso-ui-theme');
+	}
+
+
+	/**
+	 *    _set_list_table_views_default
+	 *
+	 * @access protected
+	 * @return void
+	 */
+	protected function _set_list_table_views_default()
+	{
+		$this->_views = array(
+			'all'       => array(
+				'slug'  => 'all',
+				'label' => esc_html__('View All Transactions', 'event_espresso'),
+				'count' => 0,
+			),
+			'abandoned' => array(
+				'slug'  => 'abandoned',
+				'label' => esc_html__('Abandoned Transactions', 'event_espresso'),
+				'count' => 0,
+			),
+			'incomplete' => array(
+				'slug'  => 'incomplete',
+				'label' => esc_html__('Incomplete Transactions', 'event_espresso'),
+				'count' => 0,
+			)
+		);
+		if (/**
+		 * Filters whether a link to the "Failed Transactions" list table
+		 * appears on the Transactions Admin Page list table.
+		 * List display can be turned back on via the following:
+		 * add_filter(
+		 *     'FHEE__Transactions_Admin_Page___set_list_table_views_default__display_failed_txns_list',
+		 *     '__return_true'
+		 * );
+		 *
+		 * @since 4.9.70.p
+		 * @param boolean                 $display_failed_txns_list
+		 * @param Transactions_Admin_Page $this
+		 */
+			apply_filters(
+				'FHEE__Transactions_Admin_Page___set_list_table_views_default__display_failed_txns_list',
+				false,
+				$this
+			)
+		) {
+			$this->_views['failed'] = array(
+				'slug'  => 'failed',
+				'label' => esc_html__('Failed Transactions', 'event_espresso'),
+				'count' => 0,
+			);
+		}
+	}
+
+
+	/**
+	 * _set_transaction_object
+	 * This sets the _transaction property for the transaction details screen
+	 *
+	 * @access private
+	 * @return void
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws RuntimeException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 * @throws ReflectionException
+	 */
+	private function _set_transaction_object()
+	{
+		if ($this->_transaction instanceof EE_Transaction) {
+			return;
+		} //get out we've already set the object
+
+		$TXN_ID = ! empty($this->_req_data['TXN_ID'])
+			? absint($this->_req_data['TXN_ID'])
+			: false;
+
+		// get transaction object
+		$this->_transaction = EEM_Transaction::instance()->get_one_by_ID($TXN_ID);
+		$this->_session = $this->_transaction instanceof EE_Transaction
+			? $this->_transaction->get('TXN_session_data')
+			: null;
+		if ($this->_transaction instanceof EE_Transaction) {
+			$this->_transaction->verify_abandoned_transaction_status();
+		}
+
+		if (! $this->_transaction instanceof EE_Transaction) {
+			$error_msg = sprintf(
+				esc_html__(
+					'An error occurred and the details for the transaction with the ID # %d could not be retrieved.',
+					'event_espresso'
+				),
+				$TXN_ID
+			);
+			EE_Error::add_error($error_msg, __FILE__, __FUNCTION__, __LINE__);
+		}
+	}
+
+
+	/**
+	 *    _transaction_legend_items
+	 *
+	 * @access protected
+	 * @return array
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws ReflectionException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 */
+	protected function _transaction_legend_items()
+	{
+		EE_Registry::instance()->load_helper('MSG_Template');
+		$items = array();
+
+		if (EE_Registry::instance()->CAP->current_user_can(
+			'ee_read_global_messages',
+			'view_filtered_messages'
+		)) {
+			$related_for_icon = EEH_MSG_Template::get_message_action_icon('see_notifications_for');
+			if (is_array($related_for_icon)
+				&& isset($related_for_icon['css_class'], $related_for_icon['label'])
+			) {
+				$items['view_related_messages'] = array(
+					'class' => $related_for_icon['css_class'],
+					'desc'  => $related_for_icon['label'],
+				);
+			}
+		}
+
+		$items = apply_filters(
+			'FHEE__Transactions_Admin_Page___transaction_legend_items__items',
+			array_merge(
+				$items,
+				array(
+					'view_details'          => array(
+						'class' => 'dashicons dashicons-cart',
+						'desc'  => esc_html__('View Transaction Details', 'event_espresso'),
+					),
+					'view_invoice'          => array(
+						'class' => 'dashicons dashicons-media-spreadsheet',
+						'desc'  => esc_html__('View Transaction Invoice', 'event_espresso'),
+					),
+					'view_receipt'          => array(
+						'class' => 'dashicons dashicons-media-default',
+						'desc'  => esc_html__('View Transaction Receipt', 'event_espresso'),
+					),
+					'view_registration'     => array(
+						'class' => 'dashicons dashicons-clipboard',
+						'desc'  => esc_html__('View Registration Details', 'event_espresso'),
+					),
+					'payment_overview_link' => array(
+						'class' => 'dashicons dashicons-money',
+						'desc'  => esc_html__('Make Payment on Frontend', 'event_espresso'),
+					),
+				)
+			)
+		);
+
+		if (EE_Registry::instance()->CAP->current_user_can(
+			'ee_send_message',
+			'espresso_transactions_send_payment_reminder'
+		)) {
+			if (EEH_MSG_Template::is_mt_active('payment_reminder')) {
+				$items['send_payment_reminder'] = array(
+					'class' => 'dashicons dashicons-email-alt',
+					'desc'  => esc_html__('Send Payment Reminder', 'event_espresso'),
+				);
+			} else {
+				$items['blank*'] = array(
+					'class' => '',
+					'desc'  => '',
+				);
+			}
+		} else {
+			$items['blank*'] = array(
+				'class' => '',
+				'desc'  => '',
+			);
+		}
+		$more_items = apply_filters(
+			'FHEE__Transactions_Admin_Page___transaction_legend_items__more_items',
+			array(
+				'overpaid'   => array(
+					'class' => 'ee-status-legend ee-status-legend-' . EEM_Transaction::overpaid_status_code,
+					'desc'  => EEH_Template::pretty_status(
+						EEM_Transaction::overpaid_status_code,
+						false,
+						'sentence'
+					),
+				),
+				'complete'   => array(
+					'class' => 'ee-status-legend ee-status-legend-' . EEM_Transaction::complete_status_code,
+					'desc'  => EEH_Template::pretty_status(
+						EEM_Transaction::complete_status_code,
+						false,
+						'sentence'
+					),
+				),
+				'incomplete' => array(
+					'class' => 'ee-status-legend ee-status-legend-' . EEM_Transaction::incomplete_status_code,
+					'desc'  => EEH_Template::pretty_status(
+						EEM_Transaction::incomplete_status_code,
+						false,
+						'sentence'
+					),
+				),
+				'abandoned'  => array(
+					'class' => 'ee-status-legend ee-status-legend-' . EEM_Transaction::abandoned_status_code,
+					'desc'  => EEH_Template::pretty_status(
+						EEM_Transaction::abandoned_status_code,
+						false,
+						'sentence'
+					),
+				),
+				'failed'     => array(
+					'class' => 'ee-status-legend ee-status-legend-' . EEM_Transaction::failed_status_code,
+					'desc'  => EEH_Template::pretty_status(
+						EEM_Transaction::failed_status_code,
+						false,
+						'sentence'
+					),
+				),
+			)
+		);
+
+		return array_merge($items, $more_items);
+	}
+
+
+	/**
+	 *    _transactions_overview_list_table
+	 *
+	 * @access protected
+	 * @return void
+	 * @throws DomainException
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 * @throws ReflectionException
+	 */
+	protected function _transactions_overview_list_table()
+	{
+		$this->_admin_page_title = esc_html__('Transactions', 'event_espresso');
+		$event = isset($this->_req_data['EVT_ID'])
+			? EEM_Event::instance()->get_one_by_ID($this->_req_data['EVT_ID'])
+			: null;
+		$this->_template_args['admin_page_header'] = $event instanceof EE_Event
+			? sprintf(
+				esc_html__(
+					'%sViewing Transactions for the Event: %s%s',
+					'event_espresso'
+				),
+				'<h3>',
+				'<a href="'
+				. EE_Admin_Page::add_query_args_and_nonce(
+					array('action' => 'edit', 'post' => $event->ID()),
+					EVENTS_ADMIN_URL
+				)
+				. '" title="'
+				. esc_attr__(
+					'Click to Edit event',
+					'event_espresso'
+				)
+				. '">' . $event->get('EVT_name') . '</a>',
+				'</h3>'
+			)
+			: '';
+		$this->_template_args['after_list_table'] = $this->_display_legend($this->_transaction_legend_items());
+		$this->display_admin_list_table_page_with_no_sidebar();
+	}
+
+
+	/**
+	 *    _transaction_details
+	 * generates HTML for the View Transaction Details Admin page
+	 *
+	 * @access protected
+	 * @return void
+	 * @throws DomainException
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 * @throws RuntimeException
+	 * @throws ReflectionException
+	 */
+	protected function _transaction_details()
+	{
+		do_action('AHEE__Transactions_Admin_Page__transaction_details__start', $this->_transaction);
+
+		$this->_set_transaction_status_array();
+
+		$this->_template_args = array();
+		$this->_template_args['transactions_page'] = $this->_wp_page_slug;
+
+		$this->_set_transaction_object();
+
+		if (! $this->_transaction instanceof EE_Transaction) {
+			return;
+		}
+		$primary_registration = $this->_transaction->primary_registration();
+		$attendee = $primary_registration instanceof EE_Registration
+			? $primary_registration->attendee()
+			: null;
+
+		$this->_template_args['txn_nmbr']['value'] = $this->_transaction->ID();
+		$this->_template_args['txn_nmbr']['label'] = esc_html__('Transaction Number', 'event_espresso');
+
+		$this->_template_args['txn_datetime']['value'] = $this->_transaction->get_i18n_datetime('TXN_timestamp');
+		$this->_template_args['txn_datetime']['label'] = esc_html__('Date', 'event_espresso');
+
+		$this->_template_args['txn_status']['value'] = self::$_txn_status[ $this->_transaction->get('STS_ID') ];
+		$this->_template_args['txn_status']['label'] = esc_html__('Transaction Status', 'event_espresso');
+		$this->_template_args['txn_status']['class'] = 'status-' . $this->_transaction->get('STS_ID');
+
+		$this->_template_args['grand_total'] = $this->_transaction->get('TXN_total');
+		$this->_template_args['total_paid'] = $this->_transaction->get('TXN_paid');
+
+		$amount_due = $this->_transaction->get('TXN_total') - $this->_transaction->get('TXN_paid');
+		$this->_template_args['amount_due'] = EEH_Template::format_currency(
+			$amount_due,
+			true
+		);
+		if (EE_Registry::instance()->CFG->currency->sign_b4) {
+			$this->_template_args['amount_due'] = EE_Registry::instance()->CFG->currency->sign
+												  . $this->_template_args['amount_due'];
+		} else {
+			$this->_template_args['amount_due'] .= EE_Registry::instance()->CFG->currency->sign;
+		}
+		$this->_template_args['amount_due_class'] = '';
+
+		if ($this->_transaction->get('TXN_paid') == $this->_transaction->get('TXN_total')) {
+			// paid in full
+			$this->_template_args['amount_due'] = false;
+		} elseif ($this->_transaction->get('TXN_paid') > $this->_transaction->get('TXN_total')) {
+			// overpaid
+			$this->_template_args['amount_due_class'] = 'txn-overview-no-payment-spn';
+		} elseif ($this->_transaction->get('TXN_total') > 0
+				  && $this->_transaction->get('TXN_paid') > 0
+		) {
+			// monies owing
+			$this->_template_args['amount_due_class'] = 'txn-overview-part-payment-spn';
+		} elseif ($this->_transaction->get('TXN_total') > 0
+				  && $this->_transaction->get('TXN_paid') == 0
+		) {
+			// no payments made yet
+			$this->_template_args['amount_due_class'] = 'txn-overview-no-payment-spn';
+		} elseif ($this->_transaction->get('TXN_total') == 0) {
+			// free event
+			$this->_template_args['amount_due'] = false;
+		}
+
+		$payment_method = $this->_transaction->payment_method();
+
+		$this->_template_args['method_of_payment_name'] = $payment_method instanceof EE_Payment_Method
+			? $payment_method->admin_name()
+			: esc_html__('Unknown', 'event_espresso');
+
+		$this->_template_args['currency_sign'] = EE_Registry::instance()->CFG->currency->sign;
+		// link back to overview
+		$this->_template_args['txn_overview_url'] = ! empty($_SERVER['HTTP_REFERER'])
+			? $_SERVER['HTTP_REFERER']
+			: TXN_ADMIN_URL;
+
+
+		// next link
+		$next_txn = $this->_transaction->next(
+			null,
+			array(array('STS_ID' => array('!=', EEM_Transaction::failed_status_code))),
+			'TXN_ID'
+		);
+		$this->_template_args['next_transaction'] = $next_txn
+			? $this->_next_link(
+				EE_Admin_Page::add_query_args_and_nonce(
+					array('action' => 'view_transaction', 'TXN_ID' => $next_txn['TXN_ID']),
+					TXN_ADMIN_URL
+				),
+				'dashicons dashicons-arrow-right ee-icon-size-22'
+			)
+			: '';
+		// previous link
+		$previous_txn = $this->_transaction->previous(
+			null,
+			array(array('STS_ID' => array('!=', EEM_Transaction::failed_status_code))),
+			'TXN_ID'
+		);
+		$this->_template_args['previous_transaction'] = $previous_txn
+			? $this->_previous_link(
+				EE_Admin_Page::add_query_args_and_nonce(
+					array('action' => 'view_transaction', 'TXN_ID' => $previous_txn['TXN_ID']),
+					TXN_ADMIN_URL
+				),
+				'dashicons dashicons-arrow-left ee-icon-size-22'
+			)
+			: '';
+
+		// were we just redirected here after adding a new registration ???
+		if (isset(
+			$this->_req_data['redirect_from'],
+			$this->_req_data['EVT_ID'],
+			$this->_req_data['event_name']
+		)) {
+			if (EE_Registry::instance()->CAP->current_user_can(
+				'ee_edit_registrations',
+				'espresso_registrations_new_registration',
+				$this->_req_data['EVT_ID']
+			)) {
+				$this->_admin_page_title .= '<a id="add-new-registration" class="add-new-h2 button-primary" href="';
+				$this->_admin_page_title .= EE_Admin_Page::add_query_args_and_nonce(
+					array(
+						'page'     => 'espresso_registrations',
+						'action'   => 'new_registration',
+						'return'   => 'default',
+						'TXN_ID'   => $this->_transaction->ID(),
+						'event_id' => $this->_req_data['EVT_ID'],
+					),
+					REG_ADMIN_URL
+				);
+				$this->_admin_page_title .= '">';
+
+				$this->_admin_page_title .= sprintf(
+					esc_html__('Add Another New Registration to Event: "%1$s" ?', 'event_espresso'),
+					htmlentities(urldecode($this->_req_data['event_name']), ENT_QUOTES, 'UTF-8')
+				);
+				$this->_admin_page_title .= '</a>';
+			}
+			EE_Registry::instance()->SSN->clear_session(__CLASS__, __FUNCTION__);
+		}
+		// grab messages at the last second
+		$this->_template_args['notices'] = EE_Error::get_notices();
+		// path to template
+		$template_path = TXN_TEMPLATE_PATH . 'txn_admin_details_header.template.php';
+		$this->_template_args['admin_page_header'] = EEH_Template::display_template(
+			$template_path,
+			$this->_template_args,
+			true
+		);
+
+		// the details template wrapper
+		$this->display_admin_page_with_sidebar();
+	}
+
+
+	/**
+	 *        _transaction_details_metaboxes
+	 *
+	 * @access protected
+	 * @return void
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 * @throws RuntimeException
+	 * @throws ReflectionException
+	 */
+	protected function _transaction_details_metaboxes()
+	{
+
+		$this->_set_transaction_object();
+
+		if (! $this->_transaction instanceof EE_Transaction) {
+			return;
+		}
+		add_meta_box(
+			'edit-txn-details-mbox',
+			esc_html__('Transaction Details', 'event_espresso'),
+			array($this, 'txn_details_meta_box'),
+			$this->_wp_page_slug,
+			'normal',
+			'high'
+		);
+		add_meta_box(
+			'edit-txn-attendees-mbox',
+			esc_html__('Attendees Registered in this Transaction', 'event_espresso'),
+			array($this, 'txn_attendees_meta_box'),
+			$this->_wp_page_slug,
+			'normal',
+			'high',
+			array('TXN_ID' => $this->_transaction->ID())
+		);
+		add_meta_box(
+			'edit-txn-registrant-mbox',
+			esc_html__('Primary Contact', 'event_espresso'),
+			array($this, 'txn_registrant_side_meta_box'),
+			$this->_wp_page_slug,
+			'side',
+			'high'
+		);
+		add_meta_box(
+			'edit-txn-billing-info-mbox',
+			esc_html__('Billing Information', 'event_espresso'),
+			array($this, 'txn_billing_info_side_meta_box'),
+			$this->_wp_page_slug,
+			'side',
+			'high'
+		);
+	}
+
+
+	/**
+	 * Callback for transaction actions metabox.
+	 *
+	 * @param EE_Transaction|null $transaction
+	 * @throws DomainException
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 * @throws ReflectionException
+	 * @throws RuntimeException
+	 */
+	public function getActionButtons(EE_Transaction $transaction = null)
+	{
+		$content = '';
+		$actions = array();
+		if (! $transaction instanceof EE_Transaction) {
+			return $content;
+		}
+		/** @var EE_Registration $primary_registration */
+		$primary_registration = $transaction->primary_registration();
+		$attendee = $primary_registration instanceof EE_Registration
+			? $primary_registration->attendee()
+			: null;
+
+		if ($attendee instanceof EE_Attendee
+			&& EE_Registry::instance()->CAP->current_user_can(
+				'ee_send_message',
+				'espresso_transactions_send_payment_reminder'
+			)
+		) {
+			$actions['payment_reminder'] =
+				EEH_MSG_Template::is_mt_active('payment_reminder')
+				&& $this->_transaction->get('STS_ID') !== EEM_Transaction::complete_status_code
+				&& $this->_transaction->get('STS_ID') !== EEM_Transaction::overpaid_status_code
+					? EEH_Template::get_button_or_link(
+						EE_Admin_Page::add_query_args_and_nonce(
+							array(
+								'action'      => 'send_payment_reminder',
+								'TXN_ID'      => $this->_transaction->ID(),
+								'redirect_to' => 'view_transaction',
+							),
+							TXN_ADMIN_URL
+						),
+						esc_html__(' Send Payment Reminder', 'event_espresso'),
+						'button secondary-button',
+						'dashicons dashicons-email-alt'
+					)
+					: '';
+		}
+
+		if (EE_Registry::instance()->CAP->current_user_can(
+			'ee_edit_payments',
+			'espresso_transactions_recalculate_line_items'
+		)
+		) {
+			$actions['recalculate_line_items'] = EEH_Template::get_button_or_link(
+				EE_Admin_Page::add_query_args_and_nonce(
+					array(
+						'action'      => 'espresso_recalculate_line_items',
+						'TXN_ID'      => $this->_transaction->ID(),
+						'redirect_to' => 'view_transaction',
+					),
+					TXN_ADMIN_URL
+				),
+				esc_html__(' Recalculate Taxes and Total', 'event_espresso'),
+				'button secondary-button',
+				'dashicons dashicons-update'
+			);
+		}
+
+		if ($primary_registration instanceof EE_Registration
+			&& EEH_MSG_Template::is_mt_active('receipt')
+		) {
+			$actions['receipt'] = EEH_Template::get_button_or_link(
+				$primary_registration->receipt_url(),
+				esc_html__('View Receipt', 'event_espresso'),
+				'button secondary-button',
+				'dashicons dashicons-media-default'
+			);
+		}
+
+		if ($primary_registration instanceof EE_Registration
+			&& EEH_MSG_Template::is_mt_active('invoice')
+		) {
+			$actions['invoice'] = EEH_Template::get_button_or_link(
+				$primary_registration->invoice_url(),
+				esc_html__('View Invoice', 'event_espresso'),
+				'button secondary-button',
+				'dashicons dashicons-media-spreadsheet'
+			);
+		}
+		$actions = array_filter(
+			apply_filters('FHEE__Transactions_Admin_Page__getActionButtons__actions', $actions, $transaction)
+		);
+		if ($actions) {
+			$content = '<ul>';
+			$content .= '<li>' . implode('</li><li>', $actions) . '</li>';
+			$content .= '</uL>';
+		}
+		return $content;
+	}
+
+
+	/**
+	 * txn_details_meta_box
+	 * generates HTML for the Transaction main meta box
+	 *
+	 * @return void
+	 * @throws DomainException
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 * @throws RuntimeException
+	 * @throws ReflectionException
+	 */
+	public function txn_details_meta_box()
+	{
+		$this->_set_transaction_object();
+		$this->_template_args['TXN_ID'] = $this->_transaction->ID();
+		$this->_template_args['attendee'] = $this->_transaction->primary_registration() instanceof EE_Registration
+			? $this->_transaction->primary_registration()->attendee()
+			: null;
+		$this->_template_args['can_edit_payments'] = EE_Registry::instance()->CAP->current_user_can(
+			'ee_edit_payments',
+			'apply_payment_or_refund_from_registration_details'
+		);
+		$this->_template_args['can_delete_payments'] = EE_Registry::instance()->CAP->current_user_can(
+			'ee_delete_payments',
+			'delete_payment_from_registration_details'
+		);
+
+		// get line table
+		EEH_Autoloader::register_line_item_display_autoloaders();
+		$Line_Item_Display = new EE_Line_Item_Display(
+			'admin_table',
+			'EE_Admin_Table_Line_Item_Display_Strategy'
+		);
+		$this->_template_args['line_item_table'] = $Line_Item_Display->display_line_item(
+			$this->_transaction->total_line_item()
+		);
+		$this->_template_args['REG_code'] = $this->_transaction->get_first_related('Registration')
+															   ->get('REG_code');
+
+		// process taxes
+		$taxes = $this->_transaction->get_many_related(
+			'Line_Item',
+			array(array('LIN_type' => EEM_Line_Item::type_tax))
+		);
+		$this->_template_args['taxes'] = ! empty($taxes) ? $taxes : false;
+
+		$this->_template_args['grand_total'] = EEH_Template::format_currency(
+			$this->_transaction->get('TXN_total'),
+			false,
+			false
+		);
+		$this->_template_args['grand_raw_total'] = $this->_transaction->get('TXN_total');
+		$this->_template_args['TXN_status'] = $this->_transaction->get('STS_ID');
+
+		// process payment details
+		$payments = $this->_transaction->get_many_related('Payment');
+		if (! empty($payments)) {
+			$this->_template_args['payments'] = $payments;
+			$this->_template_args['existing_reg_payments'] = $this->_get_registration_payment_IDs($payments);
+		} else {
+			$this->_template_args['payments'] = false;
+			$this->_template_args['existing_reg_payments'] = array();
+		}
+
+		$this->_template_args['edit_payment_url'] = add_query_arg(array('action' => 'edit_payment'), TXN_ADMIN_URL);
+		$this->_template_args['delete_payment_url'] = add_query_arg(
+			array('action' => 'espresso_delete_payment'),
+			TXN_ADMIN_URL
+		);
+
+		if (isset($txn_details['invoice_number'])) {
+			$this->_template_args['txn_details']['invoice_number']['value'] = $this->_template_args['REG_code'];
+			$this->_template_args['txn_details']['invoice_number']['label'] = esc_html__(
+				'Invoice Number',
+				'event_espresso'
+			);
+		}
+
+		$this->_template_args['txn_details']['registration_session']['value'] = $this->_transaction
+			->get_first_related('Registration')
+			->get('REG_session');
+		$this->_template_args['txn_details']['registration_session']['label'] = esc_html__(
+			'Registration Session',
+			'event_espresso'
+		);
+
+		$this->_template_args['txn_details']['ip_address']['value'] = isset($this->_session['ip_address'])
+			? $this->_session['ip_address']
+			: '';
+		$this->_template_args['txn_details']['ip_address']['label'] = esc_html__(
+			'Transaction placed from IP',
+			'event_espresso'
+		);
+
+		$this->_template_args['txn_details']['user_agent']['value'] = isset($this->_session['user_agent'])
+			? $this->_session['user_agent']
+			: '';
+		$this->_template_args['txn_details']['user_agent']['label'] = esc_html__(
+			'Registrant User Agent',
+			'event_espresso'
+		);
+
+		$reg_steps = '<ul>';
+		foreach ($this->_transaction->reg_steps() as $reg_step => $reg_step_status) {
+			if ($reg_step_status === true) {
+				$reg_steps .= '<li style="color:#70cc50">'
+							  . sprintf(
+								  esc_html__('%1$s : Completed', 'event_espresso'),
+								  ucwords(str_replace('_', ' ', $reg_step))
+							  )
+							  . '</li>';
+			} elseif (is_numeric($reg_step_status) && $reg_step_status !== false) {
+				$reg_steps .= '<li style="color:#2EA2CC">'
+							  . sprintf(
+								  esc_html__('%1$s : Initiated %2$s', 'event_espresso'),
+								  ucwords(str_replace('_', ' ', $reg_step)),
+								  date(
+									  get_option('date_format') . ' ' . get_option('time_format'),
+									  ($reg_step_status + (get_option('gmt_offset') * HOUR_IN_SECONDS))
+								  )
+							  )
+							  . '</li>';
+			} else {
+				$reg_steps .= '<li style="color:#E76700">'
+							  . sprintf(
+								  esc_html__('%1$s : Never Initiated', 'event_espresso'),
+								  ucwords(str_replace('_', ' ', $reg_step))
+							  )
+							  . '</li>';
+			}
+		}
+		$reg_steps .= '</ul>';
+		$this->_template_args['txn_details']['reg_steps']['value'] = $reg_steps;
+		$this->_template_args['txn_details']['reg_steps']['label'] = esc_html__(
+			'Registration Step Progress',
+			'event_espresso'
+		);
+
+
+		$this->_get_registrations_to_apply_payment_to();
+		$this->_get_payment_methods($payments);
+		$this->_get_payment_status_array();
+		$this->_get_reg_status_selection(); // sets up the template args for the reg status array for the transaction.
+
+		$this->_template_args['transaction_form_url'] = add_query_arg(
+			array(
+				'action'  => 'edit_transaction',
+				'process' => 'transaction',
+			),
+			TXN_ADMIN_URL
+		);
+		$this->_template_args['apply_payment_form_url'] = add_query_arg(
+			array(
+				'page'   => 'espresso_transactions',
+				'action' => 'espresso_apply_payment',
+			),
+			WP_AJAX_URL
+		);
+		$this->_template_args['delete_payment_form_url'] = add_query_arg(
+			array(
+				'page'   => 'espresso_transactions',
+				'action' => 'espresso_delete_payment',
+			),
+			WP_AJAX_URL
+		);
+
+		$this->_template_args['action_buttons'] = $this->getActionButtons($this->_transaction);
+
+		// 'espresso_delete_payment_nonce'
+
+		$template_path = TXN_TEMPLATE_PATH . 'txn_admin_details_main_meta_box_txn_details.template.php';
+		echo EEH_Template::display_template($template_path, $this->_template_args, true);
+	}
+
+
+	/**
+	 * _get_registration_payment_IDs
+	 *    generates an array of Payment IDs and their corresponding Registration IDs
+	 *
+	 * @access protected
+	 * @param EE_Payment[] $payments
+	 * @return array
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 * @throws ReflectionException
+	 */
+	protected function _get_registration_payment_IDs($payments = array())
+	{
+		$existing_reg_payments = array();
+		// get all reg payments for these payments
+		$reg_payments = EEM_Registration_Payment::instance()->get_all(
+			array(
+				array(
+					'PAY_ID' => array(
+						'IN',
+						array_keys($payments),
+					),
+				),
+			)
+		);
+		if (! empty($reg_payments)) {
+			foreach ($payments as $payment) {
+				if (! $payment instanceof EE_Payment) {
+					continue;
+				} elseif (! isset($existing_reg_payments[ $payment->ID() ])) {
+					$existing_reg_payments[ $payment->ID() ] = array();
+				}
+				foreach ($reg_payments as $reg_payment) {
+					if ($reg_payment instanceof EE_Registration_Payment
+						&& $reg_payment->payment_ID() === $payment->ID()
+					) {
+						$existing_reg_payments[ $payment->ID() ][] = $reg_payment->registration_ID();
+					}
+				}
+			}
+		}
+
+		return $existing_reg_payments;
+	}
+
+
+	/**
+	 * _get_registrations_to_apply_payment_to
+	 *    generates HTML for displaying a series of checkboxes in the admin payment modal window
+	 * which allows the admin to only apply the payment to the specific registrations
+	 *
+	 * @access protected
+	 * @return void
+	 * @throws \EE_Error
+	 */
+	protected function _get_registrations_to_apply_payment_to()
+	{
+		// we want any registration with an active status (ie: not deleted or cancelled)
+		$query_params = array(
+			array(
+				'STS_ID' => array(
+					'IN',
+					array(
+						EEM_Registration::status_id_approved,
+						EEM_Registration::status_id_pending_payment,
+						EEM_Registration::status_id_not_approved,
+					),
+				),
+			),
+		);
+		$registrations_to_apply_payment_to = EEH_HTML::br()
+											 . EEH_HTML::div(
+												 '',
+												 'txn-admin-apply-payment-to-registrations-dv',
+												 '',
+												 'clear: both; margin: 1.5em 0 0; display: none;'
+											 );
+		$registrations_to_apply_payment_to .= EEH_HTML::br() . EEH_HTML::div('', '', 'admin-primary-mbox-tbl-wrap');
+		$registrations_to_apply_payment_to .= EEH_HTML::table('', '', 'admin-primary-mbox-tbl');
+		$registrations_to_apply_payment_to .= EEH_HTML::thead(
+			EEH_HTML::tr(
+				EEH_HTML::th(esc_html__('ID', 'event_espresso')) .
+				EEH_HTML::th(esc_html__('Registrant', 'event_espresso')) .
+				EEH_HTML::th(esc_html__('Ticket', 'event_espresso')) .
+				EEH_HTML::th(esc_html__('Event', 'event_espresso')) .
+				EEH_HTML::th(esc_html__('Paid', 'event_espresso'), '', 'txn-admin-payment-paid-td jst-cntr') .
+				EEH_HTML::th(esc_html__('Owing', 'event_espresso'), '', 'txn-admin-payment-owing-td jst-cntr') .
+				EEH_HTML::th(esc_html__('Apply', 'event_espresso'), '', 'jst-cntr')
+			)
+		);
+		$registrations_to_apply_payment_to .= EEH_HTML::tbody();
+		// get registrations for TXN
+		$registrations = $this->_transaction->registrations($query_params);
+		$existing_reg_payments = $this->_template_args['existing_reg_payments'];
+		foreach ($registrations as $registration) {
+			if ($registration instanceof EE_Registration) {
+				$attendee_name = $registration->attendee() instanceof EE_Attendee
+					? $registration->attendee()->full_name()
+					: esc_html__('Unknown Attendee', 'event_espresso');
+				$owing = $registration->final_price() - $registration->paid();
+				$taxable = $registration->ticket()->taxable()
+					? ' <span class="smaller-text lt-grey-text"> ' . esc_html__('+ tax', 'event_espresso') . '</span>'
+					: '';
+				$checked = empty($existing_reg_payments) || in_array($registration->ID(), $existing_reg_payments)
+					? ' checked="checked"'
+					: '';
+				$disabled = $registration->final_price() > 0 ? '' : ' disabled';
+				$registrations_to_apply_payment_to .= EEH_HTML::tr(
+					EEH_HTML::td($registration->ID()) .
+					EEH_HTML::td($attendee_name) .
+					EEH_HTML::td(
+						$registration->ticket()->name() . ' : ' . $registration->ticket()->pretty_price() . $taxable
+					) .
+					EEH_HTML::td($registration->event_name()) .
+					EEH_HTML::td($registration->pretty_paid(), '', 'txn-admin-payment-paid-td jst-cntr') .
+					EEH_HTML::td(EEH_Template::format_currency($owing), '', 'txn-admin-payment-owing-td jst-cntr') .
+					EEH_HTML::td(
+						'<input type="checkbox" value="' . $registration->ID()
+						. '" name="txn_admin_payment[registrations]"'
+						. $checked . $disabled . '>',
+						'',
+						'jst-cntr'
+					),
+					'apply-payment-registration-row-' . $registration->ID()
+				);
+			}
+		}
+		$registrations_to_apply_payment_to .= EEH_HTML::tbodyx();
+		$registrations_to_apply_payment_to .= EEH_HTML::tablex();
+		$registrations_to_apply_payment_to .= EEH_HTML::divx();
+		$registrations_to_apply_payment_to .= EEH_HTML::p(
+			esc_html__(
+				'The payment will only be applied to the registrations that have a check mark in their corresponding check box. Checkboxes for free registrations have been disabled.',
+				'event_espresso'
+			),
+			'',
+			'clear description'
+		);
+		$registrations_to_apply_payment_to .= EEH_HTML::divx();
+		$this->_template_args['registrations_to_apply_payment_to'] = $registrations_to_apply_payment_to;
+	}
+
+
+	/**
+	 * _get_reg_status_selection
+	 *
+	 * @todo   this will need to be adjusted either once MER comes along OR we move default reg status to tickets
+	 *         instead of events.
+	 * @access protected
+	 * @return void
+	 * @throws EE_Error
+	 */
+	protected function _get_reg_status_selection()
+	{
+		// first get all possible statuses
+		$statuses = EEM_Registration::reg_status_array(array(), true);
+		// let's add a "don't change" option.
+		$status_array['NAN'] = esc_html__('Leave the Same', 'event_espresso');
+		$status_array = array_merge($status_array, $statuses);
+		$this->_template_args['status_change_select'] = EEH_Form_Fields::select_input(
+			'txn_reg_status_change[reg_status]',
+			$status_array,
+			'NAN',
+			'id="txn-admin-payment-reg-status-inp"',
+			'txn-reg-status-change-reg-status'
+		);
+		$this->_template_args['delete_status_change_select'] = EEH_Form_Fields::select_input(
+			'delete_txn_reg_status_change[reg_status]',
+			$status_array,
+			'NAN',
+			'delete-txn-admin-payment-reg-status-inp',
+			'delete-txn-reg-status-change-reg-status'
+		);
+	}
+
+
+	/**
+	 *    _get_payment_methods
+	 * Gets all the payment methods available generally, or the ones that are already
+	 * selected on these payments (in case their payment methods are no longer active).
+	 * Has the side-effect of updating the template args' payment_methods item
+	 *
+	 * @access private
+	 * @param EE_Payment[] to show on this page
+	 * @return void
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 * @throws ReflectionException
+	 */
+	private function _get_payment_methods($payments = array())
+	{
+		$payment_methods_of_payments = array();
+		foreach ($payments as $payment) {
+			if ($payment instanceof EE_Payment) {
+				$payment_methods_of_payments[] = $payment->get('PMD_ID');
+			}
+		}
+		if ($payment_methods_of_payments) {
+			$query_args = array(
+				array(
+					'OR*payment_method_for_payment' => array(
+						'PMD_ID'    => array('IN', $payment_methods_of_payments),
+						'PMD_scope' => array('LIKE', '%' . EEM_Payment_Method::scope_admin . '%'),
+					),
+				),
+			);
+		} else {
+			$query_args = array(array('PMD_scope' => array('LIKE', '%' . EEM_Payment_Method::scope_admin . '%')));
+		}
+		$this->_template_args['payment_methods'] = EEM_Payment_Method::instance()->get_all($query_args);
+	}
+
+
+	/**
+	 * txn_attendees_meta_box
+	 *    generates HTML for the Attendees Transaction main meta box
+	 *
+	 * @access public
+	 * @param WP_Post $post
+	 * @param array   $metabox
+	 * @return void
+	 * @throws DomainException
+	 * @throws EE_Error
+	 */
+	public function txn_attendees_meta_box($post, $metabox = array('args' => array()))
+	{
+
+		/** @noinspection NonSecureExtractUsageInspection */
+		extract($metabox['args']);
+		$this->_template_args['post'] = $post;
+		$this->_template_args['event_attendees'] = array();
+		// process items in cart
+		$line_items = $this->_transaction->get_many_related(
+			'Line_Item',
+			array(array('LIN_type' => 'line-item'))
+		);
+		if (! empty($line_items)) {
+			foreach ($line_items as $item) {
+				if ($item instanceof EE_Line_Item) {
+					switch ($item->OBJ_type()) {
+						case 'Event':
+							break;
+						case 'Ticket':
+							$ticket = $item->ticket();
+							// right now we're only handling tickets here.
+							// Cause its expected that only tickets will have attendees right?
+							if (! $ticket instanceof EE_Ticket) {
+								continue;
+							}
+							try {
+								$event_name = $ticket->get_event_name();
+							} catch (Exception $e) {
+								EE_Error::add_error($e->getMessage(), __FILE__, __FUNCTION__, __LINE__);
+								$event_name = esc_html__('Unknown Event', 'event_espresso');
+							}
+							$event_name .= ' - ' . $item->get('LIN_name');
+							$ticket_price = EEH_Template::format_currency($item->get('LIN_unit_price'));
+							// now get all of the registrations for this transaction that use this ticket
+							$registrations = $ticket->get_many_related(
+								'Registration',
+								array(array('TXN_ID' => $this->_transaction->ID()))
+							);
+							foreach ($registrations as $registration) {
+								if (! $registration instanceof EE_Registration) {
+									continue;
+								}
+								$this->_template_args['event_attendees'][ $registration->ID() ]['STS_ID']
+									= $registration->status_ID();
+								$this->_template_args['event_attendees'][ $registration->ID() ]['att_num']
+									= $registration->count();
+								$this->_template_args['event_attendees'][ $registration->ID() ]['event_ticket_name']
+									= $event_name;
+								$this->_template_args['event_attendees'][ $registration->ID() ]['ticket_price']
+									= $ticket_price;
+								// attendee info
+								$attendee = $registration->get_first_related('Attendee');
+								if ($attendee instanceof EE_Attendee) {
+									$this->_template_args['event_attendees'][ $registration->ID() ]['att_id']
+										= $attendee->ID();
+									$this->_template_args['event_attendees'][ $registration->ID() ]['attendee']
+										= $attendee->full_name();
+									$this->_template_args['event_attendees'][ $registration->ID() ]['email']
+										= '<a href="mailto:' . $attendee->email() . '?subject=' . $event_name
+										  . esc_html__(
+											  ' Event',
+											  'event_espresso'
+										  )
+										  . '">' . $attendee->email() . '</a>';
+									$this->_template_args['event_attendees'][ $registration->ID() ]['address']
+										= EEH_Address::format($attendee, 'inline', false, false);
+								} else {
+									$this->_template_args['event_attendees'][ $registration->ID() ]['att_id'] = '';
+									$this->_template_args['event_attendees'][ $registration->ID() ]['attendee'] = '';
+									$this->_template_args['event_attendees'][ $registration->ID() ]['email'] = '';
+									$this->_template_args['event_attendees'][ $registration->ID() ]['address'] = '';
+								}
+							}
+							break;
+					}
+				}
+			}
+
+			$this->_template_args['transaction_form_url'] = add_query_arg(
+				array(
+					'action'  => 'edit_transaction',
+					'process' => 'attendees',
+				),
+				TXN_ADMIN_URL
+			);
+			echo EEH_Template::display_template(
+				TXN_TEMPLATE_PATH . 'txn_admin_details_main_meta_box_attendees.template.php',
+				$this->_template_args,
+				true
+			);
+		} else {
+			echo sprintf(
+				esc_html__(
+					'%1$sFor some reason, there are no attendees registered for this transaction. Likely the registration was abandoned in process.%2$s',
+					'event_espresso'
+				),
+				'<p class="important-notice">',
+				'</p>'
+			);
+		}
+	}
+
+
+	/**
+	 * txn_registrant_side_meta_box
+	 * generates HTML for the Edit Transaction side meta box
+	 *
+	 * @access public
+	 * @return void
+	 * @throws DomainException
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 * @throws ReflectionException
+	 */
+	public function txn_registrant_side_meta_box()
+	{
+		$primary_att = $this->_transaction->primary_registration() instanceof EE_Registration
+			? $this->_transaction->primary_registration()->get_first_related('Attendee')
+			: null;
+		if (! $primary_att instanceof EE_Attendee) {
+			$this->_template_args['no_attendee_message'] = esc_html__(
+				'There is no attached contact for this transaction.  The transaction either failed due to an error or was abandoned.',
+				'event_espresso'
+			);
+			$primary_att = EEM_Attendee::instance()->create_default_object();
+		}
+		$this->_template_args['ATT_ID'] = $primary_att->ID();
+		$this->_template_args['prime_reg_fname'] = $primary_att->fname();
+		$this->_template_args['prime_reg_lname'] = $primary_att->lname();
+		$this->_template_args['prime_reg_email'] = $primary_att->email();
+		$this->_template_args['prime_reg_phone'] = $primary_att->phone();
+		$this->_template_args['edit_attendee_url'] = EE_Admin_Page::add_query_args_and_nonce(
+			array(
+				'action' => 'edit_attendee',
+				'post'   => $primary_att->ID(),
+			),
+			REG_ADMIN_URL
+		);
+		// get formatted address for registrant
+		$this->_template_args['formatted_address'] = EEH_Address::format($primary_att);
+		echo EEH_Template::display_template(
+			TXN_TEMPLATE_PATH . 'txn_admin_details_side_meta_box_registrant.template.php',
+			$this->_template_args,
+			true
+		);
+	}
+
+
+	/**
+	 * txn_billing_info_side_meta_box
+	 *    generates HTML for the Edit Transaction side meta box
+	 *
+	 * @access public
+	 * @return void
+	 * @throws DomainException
+	 * @throws EE_Error
+	 */
+	public function txn_billing_info_side_meta_box()
+	{
+
+		$this->_template_args['billing_form'] = $this->_transaction->billing_info();
+		$this->_template_args['billing_form_url'] = add_query_arg(
+			array('action' => 'edit_transaction', 'process' => 'billing'),
+			TXN_ADMIN_URL
+		);
+
+		$template_path = TXN_TEMPLATE_PATH . 'txn_admin_details_side_meta_box_billing_info.template.php';
+		echo EEH_Template::display_template($template_path, $this->_template_args, true);/**/
+	}
+
+
+	/**
+	 * apply_payments_or_refunds
+	 *    registers a payment or refund made towards a transaction
+	 *
+	 * @access public
+	 * @return void
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws ReflectionException
+	 * @throws RuntimeException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 */
+	public function apply_payments_or_refunds()
+	{
+		$json_response_data = array('return_data' => false);
+		$valid_data = $this->_validate_payment_request_data();
+		$has_access = EE_Registry::instance()->CAP->current_user_can(
+			'ee_edit_payments',
+			'apply_payment_or_refund_from_registration_details'
+		);
+		if (! empty($valid_data) && $has_access) {
+			$PAY_ID = $valid_data['PAY_ID'];
+			// save  the new payment
+			$payment = $this->_create_payment_from_request_data($valid_data);
+			// get the TXN for this payment
+			$transaction = $payment->transaction();
+			// verify transaction
+			if ($transaction instanceof EE_Transaction) {
+				// calculate_total_payments_and_update_status
+				$this->_process_transaction_payments($transaction);
+				$REG_IDs = $this->_get_REG_IDs_to_apply_payment_to($payment);
+				$this->_remove_existing_registration_payments($payment, $PAY_ID);
+				// apply payment to registrations (if applicable)
+				if (! empty($REG_IDs)) {
+					$this->_update_registration_payments($transaction, $payment, $REG_IDs);
+					$this->_maybe_send_notifications();
+					// now process status changes for the same registrations
+					$this->_process_registration_status_change($transaction, $REG_IDs);
+				}
+				$this->_maybe_send_notifications($payment);
+				// prepare to render page
+				$json_response_data['return_data'] = $this->_build_payment_json_response($payment, $REG_IDs);
+				do_action(
+					'AHEE__Transactions_Admin_Page__apply_payments_or_refund__after_recording',
+					$transaction,
+					$payment
+				);
+			} else {
+				EE_Error::add_error(
+					esc_html__(
+						'A valid Transaction for this payment could not be retrieved.',
+						'event_espresso'
+					),
+					__FILE__,
+					__FUNCTION__,
+					__LINE__
+				);
+			}
+		} else {
+			if ($has_access) {
+				EE_Error::add_error(
+					esc_html__(
+						'The payment form data could not be processed. Please try again.',
+						'event_espresso'
+					),
+					__FILE__,
+					__FUNCTION__,
+					__LINE__
+				);
+			} else {
+				EE_Error::add_error(
+					esc_html__(
+						'You do not have access to apply payments or refunds to a registration.',
+						'event_espresso'
+					),
+					__FILE__,
+					__FUNCTION__,
+					__LINE__
+				);
+			}
+		}
+		$notices = EE_Error::get_notices(
+			false,
+			false,
+			false
+		);
+		$this->_template_args = array(
+			'data'    => $json_response_data,
+			'error'   => $notices['errors'],
+			'success' => $notices['success'],
+		);
+		$this->_return_json();
+	}
+
+
+	/**
+	 * _validate_payment_request_data
+	 *
+	 * @return array
+	 * @throws EE_Error
+	 */
+	protected function _validate_payment_request_data()
+	{
+		if (! isset($this->_req_data['txn_admin_payment'])) {
+			return false;
+		}
+		$payment_form = $this->_generate_payment_form_section();
+		try {
+			if ($payment_form->was_submitted()) {
+				$payment_form->receive_form_submission();
+				if (! $payment_form->is_valid()) {
+					$submission_error_messages = array();
+					foreach ($payment_form->get_validation_errors_accumulated() as $validation_error) {
+						if ($validation_error instanceof EE_Validation_Error) {
+							$submission_error_messages[] = sprintf(
+								_x('%s : %s', 'Form Section Name : Form Validation Error', 'event_espresso'),
+								$validation_error->get_form_section()->html_label_text(),
+								$validation_error->getMessage()
+							);
+						}
+					}
+					EE_Error::add_error(
+						implode('<br />', $submission_error_messages),
+						__FILE__,
+						__FUNCTION__,
+						__LINE__
+					);
+
+					return array();
+				}
+			}
+		} catch (EE_Error $e) {
+			EE_Error::add_error($e->getMessage(), __FILE__, __FUNCTION__, __LINE__);
+
+			return array();
+		}
+
+		return $payment_form->valid_data();
+	}
+
+
+	/**
+	 * _generate_payment_form_section
+	 *
+	 * @return EE_Form_Section_Proper
+	 * @throws EE_Error
+	 */
+	protected function _generate_payment_form_section()
+	{
+		return new EE_Form_Section_Proper(
+			array(
+				'name'        => 'txn_admin_payment',
+				'subsections' => array(
+					'PAY_ID'          => new EE_Text_Input(
+						array(
+							'default'               => 0,
+							'required'              => false,
+							'html_label_text'       => esc_html__('Payment ID', 'event_espresso'),
+							'validation_strategies' => array(new EE_Int_Normalization()),
+						)
+					),
+					'TXN_ID'          => new EE_Text_Input(
+						array(
+							'default'               => 0,
+							'required'              => true,
+							'html_label_text'       => esc_html__('Transaction ID', 'event_espresso'),
+							'validation_strategies' => array(new EE_Int_Normalization()),
+						)
+					),
+					'type'            => new EE_Text_Input(
+						array(
+							'default'               => 1,
+							'required'              => true,
+							'html_label_text'       => esc_html__('Payment or Refund', 'event_espresso'),
+							'validation_strategies' => array(new EE_Int_Normalization()),
+						)
+					),
+					'amount'          => new EE_Text_Input(
+						array(
+							'default'               => 0,
+							'required'              => true,
+							'html_label_text'       => esc_html__('Payment amount', 'event_espresso'),
+							'validation_strategies' => array(new EE_Float_Normalization()),
+						)
+					),
+					'status'          => new EE_Text_Input(
+						array(
+							'default'         => EEM_Payment::status_id_approved,
+							'required'        => true,
+							'html_label_text' => esc_html__('Payment status', 'event_espresso'),
+						)
+					),
+					'PMD_ID'          => new EE_Text_Input(
+						array(
+							'default'               => 2,
+							'required'              => true,
+							'html_label_text'       => esc_html__('Payment Method', 'event_espresso'),
+							'validation_strategies' => array(new EE_Int_Normalization()),
+						)
+					),
+					'date'            => new EE_Text_Input(
+						array(
+							'default'         => time(),
+							'required'        => true,
+							'html_label_text' => esc_html__('Payment date', 'event_espresso'),
+						)
+					),
+					'txn_id_chq_nmbr' => new EE_Text_Input(
+						array(
+							'default'               => '',
+							'required'              => false,
+							'html_label_text'       => esc_html__('Transaction or Cheque Number', 'event_espresso'),
+							'validation_strategies' => array(
+								new EE_Max_Length_Validation_Strategy(
+									esc_html__('Input too long', 'event_espresso'),
+									100
+								),
+							),
+						)
+					),
+					'po_number'       => new EE_Text_Input(
+						array(
+							'default'               => '',
+							'required'              => false,
+							'html_label_text'       => esc_html__('Purchase Order Number', 'event_espresso'),
+							'validation_strategies' => array(
+								new EE_Max_Length_Validation_Strategy(
+									esc_html__('Input too long', 'event_espresso'),
+									100
+								),
+							),
+						)
+					),
+					'accounting'      => new EE_Text_Input(
+						array(
+							'default'               => '',
+							'required'              => false,
+							'html_label_text'       => esc_html__('Extra Field for Accounting', 'event_espresso'),
+							'validation_strategies' => array(
+								new EE_Max_Length_Validation_Strategy(
+									esc_html__('Input too long', 'event_espresso'),
+									100
+								),
+							),
+						)
+					),
+				),
+			)
+		);
+	}
+
+
+	/**
+	 * _create_payment_from_request_data
+	 *
+	 * @param array $valid_data
+	 * @return EE_Payment
+	 * @throws EE_Error
+	 */
+	protected function _create_payment_from_request_data($valid_data)
+	{
+		$PAY_ID = $valid_data['PAY_ID'];
+		// get payment amount
+		$amount = $valid_data['amount'] ? abs($valid_data['amount']) : 0;
+		// payments have a type value of 1 and refunds have a type value of -1
+		// so multiplying amount by type will give a positive value for payments, and negative values for refunds
+		$amount = $valid_data['type'] < 0 ? $amount * -1 : $amount;
+		// for some reason the date string coming in has extra spaces between the date and time.  This fixes that.
+		$date = $valid_data['date']
+			? preg_replace('/\s+/', ' ', $valid_data['date'])
+			: date('Y-m-d g:i a', current_time('timestamp'));
+		$payment = EE_Payment::new_instance(
+			array(
+				'TXN_ID'              => $valid_data['TXN_ID'],
+				'STS_ID'              => $valid_data['status'],
+				'PAY_timestamp'       => $date,
+				'PAY_source'          => EEM_Payment_Method::scope_admin,
+				'PMD_ID'              => $valid_data['PMD_ID'],
+				'PAY_amount'          => $amount,
+				'PAY_txn_id_chq_nmbr' => $valid_data['txn_id_chq_nmbr'],
+				'PAY_po_number'       => $valid_data['po_number'],
+				'PAY_extra_accntng'   => $valid_data['accounting'],
+				'PAY_details'         => $valid_data,
+				'PAY_ID'              => $PAY_ID,
+			),
+			'',
+			array('Y-m-d', 'g:i a')
+		);
+
+		if (! $payment->save()) {
+			EE_Error::add_error(
+				sprintf(
+					esc_html__('Payment %1$d has not been successfully saved to the database.', 'event_espresso'),
+					$payment->ID()
+				),
+				__FILE__,
+				__FUNCTION__,
+				__LINE__
+			);
+		}
+
+		return $payment;
+	}
+
+
+	/**
+	 * _process_transaction_payments
+	 *
+	 * @param \EE_Transaction $transaction
+	 * @return void
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws ReflectionException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 */
+	protected function _process_transaction_payments(EE_Transaction $transaction)
+	{
+		/** @type EE_Transaction_Payments $transaction_payments */
+		$transaction_payments = EE_Registry::instance()->load_class('Transaction_Payments');
+		// update the transaction with this payment
+		if ($transaction_payments->calculate_total_payments_and_update_status($transaction)) {
+			EE_Error::add_success(
+				esc_html__(
+					'The payment has been processed successfully.',
+					'event_espresso'
+				),
+				__FILE__,
+				__FUNCTION__,
+				__LINE__
+			);
+		} else {
+			EE_Error::add_error(
+				esc_html__(
+					'The payment was processed successfully but the amount paid for the transaction was not updated.',
+					'event_espresso'
+				),
+				__FILE__,
+				__FUNCTION__,
+				__LINE__
+			);
+		}
+	}
+
+
+	/**
+	 * _get_REG_IDs_to_apply_payment_to
+	 * returns a list of registration IDs that the payment will apply to
+	 *
+	 * @param \EE_Payment $payment
+	 * @return array
+	 * @throws EE_Error
+	 */
+	protected function _get_REG_IDs_to_apply_payment_to(EE_Payment $payment)
+	{
+		$REG_IDs = array();
+		// grab array of IDs for specific registrations to apply changes to
+		if (isset($this->_req_data['txn_admin_payment']['registrations'])) {
+			$REG_IDs = (array) $this->_req_data['txn_admin_payment']['registrations'];
+		}
+		// nothing specified ? then get all reg IDs
+		if (empty($REG_IDs)) {
+			$registrations = $payment->transaction()->registrations();
+			$REG_IDs = ! empty($registrations)
+				? array_keys($registrations)
+				: $this->_get_existing_reg_payment_REG_IDs($payment);
+		}
+
+		// ensure that REG_IDs are integers and NOT strings
+		return array_map('intval', $REG_IDs);
+	}
+
+
+	/**
+	 * @return array
+	 */
+	public function existing_reg_payment_REG_IDs()
+	{
+		return $this->_existing_reg_payment_REG_IDs;
+	}
+
+
+	/**
+	 * @param array $existing_reg_payment_REG_IDs
+	 */
+	public function set_existing_reg_payment_REG_IDs($existing_reg_payment_REG_IDs = null)
+	{
+		$this->_existing_reg_payment_REG_IDs = $existing_reg_payment_REG_IDs;
+	}
+
+
+	/**
+	 * _get_existing_reg_payment_REG_IDs
+	 * returns a list of registration IDs that the payment is currently related to
+	 * as recorded in the database
+	 *
+	 * @param \EE_Payment $payment
+	 * @return array
+	 * @throws EE_Error
+	 */
+	protected function _get_existing_reg_payment_REG_IDs(EE_Payment $payment)
+	{
+		if ($this->existing_reg_payment_REG_IDs() === null) {
+			// let's get any existing reg payment records for this payment
+			$existing_reg_payment_REG_IDs = $payment->get_many_related('Registration');
+			// but we only want the REG IDs, so grab the array keys
+			$existing_reg_payment_REG_IDs = ! empty($existing_reg_payment_REG_IDs)
+				? array_keys($existing_reg_payment_REG_IDs)
+				: array();
+			$this->set_existing_reg_payment_REG_IDs($existing_reg_payment_REG_IDs);
+		}
+
+		return $this->existing_reg_payment_REG_IDs();
+	}
+
+
+	/**
+	 * _remove_existing_registration_payments
+	 * this calculates the difference between existing relations
+	 * to the supplied payment and the new list registration IDs,
+	 * removes any related registrations that no longer apply,
+	 * and then updates the registration paid fields
+	 *
+	 * @param \EE_Payment $payment
+	 * @param int         $PAY_ID
+	 * @return bool;
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws ReflectionException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 */
+	protected function _remove_existing_registration_payments(EE_Payment $payment, $PAY_ID = 0)
+	{
+		// newly created payments will have nothing recorded for $PAY_ID
+		if ($PAY_ID == 0) {
+			return false;
+		}
+		$existing_reg_payment_REG_IDs = $this->_get_existing_reg_payment_REG_IDs($payment);
+		if (empty($existing_reg_payment_REG_IDs)) {
+			return false;
+		}
+		/** @type EE_Transaction_Payments $transaction_payments */
+		$transaction_payments = EE_Registry::instance()->load_class('Transaction_Payments');
+
+		return $transaction_payments->delete_registration_payments_and_update_registrations(
+			$payment,
+			array(
+				array(
+					'PAY_ID' => $payment->ID(),
+					'REG_ID' => array('IN', $existing_reg_payment_REG_IDs),
+				),
+			)
+		);
+	}
+
+
+	/**
+	 * _update_registration_payments
+	 * this applies the payments to the selected registrations
+	 * but only if they have not already been paid for
+	 *
+	 * @param  EE_Transaction $transaction
+	 * @param \EE_Payment     $payment
+	 * @param array           $REG_IDs
+	 * @return void
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws ReflectionException
+	 * @throws RuntimeException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 */
+	protected function _update_registration_payments(
+		EE_Transaction $transaction,
+		EE_Payment $payment,
+		$REG_IDs = array()
+	) {
+		// we can pass our own custom set of registrations to EE_Payment_Processor::process_registration_payments()
+		// so let's do that using our set of REG_IDs from the form
+		$registration_query_where_params = array(
+			'REG_ID' => array('IN', $REG_IDs),
+		);
+		// but add in some conditions regarding payment,
+		// so that we don't apply payments to registrations that are free or have already been paid for
+		// but ONLY if the payment is NOT a refund ( ie: the payment amount is not negative )
+		if (! $payment->is_a_refund()) {
+			$registration_query_where_params['REG_final_price'] = array('!=', 0);
+			$registration_query_where_params['REG_final_price*'] = array('!=', 'REG_paid', true);
+		}
+		$registrations = $transaction->registrations(array($registration_query_where_params));
+		if (! empty($registrations)) {
+			/** @type EE_Payment_Processor $payment_processor */
+			$payment_processor = EE_Registry::instance()->load_core('Payment_Processor');
+			$payment_processor->process_registration_payments($transaction, $payment, $registrations);
+		}
+	}
+
+
+	/**
+	 * _process_registration_status_change
+	 * This processes requested registration status changes for all the registrations
+	 * on a given transaction and (optionally) sends out notifications for the changes.
+	 *
+	 * @param  EE_Transaction $transaction
+	 * @param array           $REG_IDs
+	 * @return bool
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws ReflectionException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 */
+	protected function _process_registration_status_change(EE_Transaction $transaction, $REG_IDs = array())
+	{
+		// first if there is no change in status then we get out.
+		if (! isset($this->_req_data['txn_reg_status_change']['reg_status'])
+			|| $this->_req_data['txn_reg_status_change']['reg_status'] === 'NAN'
+		) {
+			// no error message, no change requested, just nothing to do man.
+			return false;
+		}
+		/** @type EE_Transaction_Processor $transaction_processor */
+		$transaction_processor = EE_Registry::instance()->load_class('Transaction_Processor');
+
+		// made it here dude?  Oh WOW.  K, let's take care of changing the statuses
+		return $transaction_processor->manually_update_registration_statuses(
+			$transaction,
+			sanitize_text_field($this->_req_data['txn_reg_status_change']['reg_status']),
+			array(array('REG_ID' => array('IN', $REG_IDs)))
+		);
+	}
+
+
+	/**
+	 * _build_payment_json_response
+	 *
+	 * @access public
+	 * @param \EE_Payment $payment
+	 * @param array       $REG_IDs
+	 * @param bool | null $delete_txn_reg_status_change
+	 * @return array
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 * @throws ReflectionException
+	 */
+	protected function _build_payment_json_response(
+		EE_Payment $payment,
+		$REG_IDs = array(),
+		$delete_txn_reg_status_change = null
+	) {
+		// was the payment deleted ?
+		if (is_bool($delete_txn_reg_status_change)) {
+			return array(
+				'PAY_ID'                       => $payment->ID(),
+				'amount'                       => $payment->amount(),
+				'total_paid'                   => $payment->transaction()->paid(),
+				'txn_status'                   => $payment->transaction()->status_ID(),
+				'pay_status'                   => $payment->STS_ID(),
+				'registrations'                => $this->_registration_payment_data_array($REG_IDs),
+				'delete_txn_reg_status_change' => $delete_txn_reg_status_change,
+			);
+		} else {
+			$this->_get_payment_status_array();
+
+			return array(
+				'amount'           => $payment->amount(),
+				'total_paid'       => $payment->transaction()->paid(),
+				'txn_status'       => $payment->transaction()->status_ID(),
+				'pay_status'       => $payment->STS_ID(),
+				'PAY_ID'           => $payment->ID(),
+				'STS_ID'           => $payment->STS_ID(),
+				'status'           => self::$_pay_status[ $payment->STS_ID() ],
+				'date'             => $payment->timestamp('Y-m-d', 'h:i a'),
+				'method'           => strtoupper($payment->source()),
+				'PM_ID'            => $payment->payment_method() ? $payment->payment_method()->ID() : 1,
+				'gateway'          => $payment->payment_method()
+					? $payment->payment_method()->admin_name()
+					: esc_html__("Unknown", 'event_espresso'),
+				'gateway_response' => $payment->gateway_response(),
+				'txn_id_chq_nmbr'  => $payment->txn_id_chq_nmbr(),
+				'po_number'        => $payment->po_number(),
+				'extra_accntng'    => $payment->extra_accntng(),
+				'registrations'    => $this->_registration_payment_data_array($REG_IDs),
+			);
+		}
+	}
+
+
+	/**
+	 * delete_payment
+	 *    delete a payment or refund made towards a transaction
+	 *
+	 * @access public
+	 * @return void
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws ReflectionException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 */
+	public function delete_payment()
+	{
+		$json_response_data = array('return_data' => false);
+		$PAY_ID = isset($this->_req_data['delete_txn_admin_payment']['PAY_ID'])
+			? absint($this->_req_data['delete_txn_admin_payment']['PAY_ID'])
+			: 0;
+		$can_delete = EE_Registry::instance()->CAP->current_user_can(
+			'ee_delete_payments',
+			'delete_payment_from_registration_details'
+		);
+		if ($PAY_ID && $can_delete) {
+			$delete_txn_reg_status_change = isset($this->_req_data['delete_txn_reg_status_change'])
+				? $this->_req_data['delete_txn_reg_status_change']
+				: false;
+			$payment = EEM_Payment::instance()->get_one_by_ID($PAY_ID);
+			if ($payment instanceof EE_Payment) {
+				$REG_IDs = $this->_get_existing_reg_payment_REG_IDs($payment);
+				/** @type EE_Transaction_Payments $transaction_payments */
+				$transaction_payments = EE_Registry::instance()->load_class('Transaction_Payments');
+				if ($transaction_payments->delete_payment_and_update_transaction($payment)) {
+					$json_response_data['return_data'] = $this->_build_payment_json_response(
+						$payment,
+						$REG_IDs,
+						$delete_txn_reg_status_change
+					);
+					if ($delete_txn_reg_status_change) {
+						$this->_req_data['txn_reg_status_change'] = $delete_txn_reg_status_change;
+						// MAKE sure we also add the delete_txn_req_status_change to the
+						// $_REQUEST global because that's how messages will be looking for it.
+						$_REQUEST['txn_reg_status_change'] = $delete_txn_reg_status_change;
+						$this->_maybe_send_notifications();
+						$this->_process_registration_status_change($payment->transaction(), $REG_IDs);
+					}
+				}
+			} else {
+				EE_Error::add_error(
+					esc_html__('Valid Payment data could not be retrieved from the database.', 'event_espresso'),
+					__FILE__,
+					__FUNCTION__,
+					__LINE__
+				);
+			}
+		} else {
+			if ($can_delete) {
+				EE_Error::add_error(
+					esc_html__(
+						'A valid Payment ID was not received, therefore payment form data could not be loaded.',
+						'event_espresso'
+					),
+					__FILE__,
+					__FUNCTION__,
+					__LINE__
+				);
+			} else {
+				EE_Error::add_error(
+					esc_html__(
+						'You do not have access to delete a payment.',
+						'event_espresso'
+					),
+					__FILE__,
+					__FUNCTION__,
+					__LINE__
+				);
+			}
+		}
+		$notices = EE_Error::get_notices(false, false, false);
+		$this->_template_args = array(
+			'data'      => $json_response_data,
+			'success'   => $notices['success'],
+			'error'     => $notices['errors'],
+			'attention' => $notices['attention'],
+		);
+		$this->_return_json();
+	}
+
+
+	/**
+	 * _registration_payment_data_array
+	 * adds info for 'owing' and 'paid' for each registration to the json response
+	 *
+	 * @access protected
+	 * @param array $REG_IDs
+	 * @return array
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 * @throws ReflectionException
+	 */
+	protected function _registration_payment_data_array($REG_IDs)
+	{
+		$registration_payment_data = array();
+		// if non empty reg_ids lets get an array of registrations and update the values for the apply_payment/refund rows.
+		if (! empty($REG_IDs)) {
+			$registrations = EEM_Registration::instance()->get_all(array(array('REG_ID' => array('IN', $REG_IDs))));
+			foreach ($registrations as $registration) {
+				if ($registration instanceof EE_Registration) {
+					$registration_payment_data[ $registration->ID() ] = array(
+						'paid'  => $registration->pretty_paid(),
+						'owing' => EEH_Template::format_currency($registration->final_price() - $registration->paid()),
+					);
+				}
+			}
+		}
+
+		return $registration_payment_data;
+	}
+
+
+	/**
+	 * _maybe_send_notifications
+	 * determines whether or not the admin has indicated that notifications should be sent.
+	 * If so, will toggle a filter switch for delivering registration notices.
+	 * If passed an EE_Payment object, then it will trigger payment notifications instead.
+	 *
+	 * @access protected
+	 * @param \EE_Payment | null $payment
+	 */
+	protected function _maybe_send_notifications($payment = null)
+	{
+		switch ($payment instanceof EE_Payment) {
+			// payment notifications
+			case true:
+				if (isset(
+					$this->_req_data['txn_payments'],
+					$this->_req_data['txn_payments']['send_notifications']
+				)
+					&& filter_var($this->_req_data['txn_payments']['send_notifications'], FILTER_VALIDATE_BOOLEAN)
+				) {
+					$this->_process_payment_notification($payment);
+				}
+				break;
+			// registration notifications
+			case false:
+				if (isset(
+					$this->_req_data['txn_reg_status_change'],
+					$this->_req_data['txn_reg_status_change']['send_notifications']
+				)
+					&& filter_var($this->_req_data['txn_reg_status_change']['send_notifications'], FILTER_VALIDATE_BOOLEAN)
+				) {
+					add_filter('FHEE__EED_Messages___maybe_registration__deliver_notifications', '__return_true');
+				}
+				break;
+		}
+	}
+
+
+	/**
+	 * _send_payment_reminder
+	 *    generates HTML for the View Transaction Details Admin page
+	 *
+	 * @access protected
+	 * @return void
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 */
+	protected function _send_payment_reminder()
+	{
+		$TXN_ID = ! empty($this->_req_data['TXN_ID']) ? absint($this->_req_data['TXN_ID']) : false;
+		$transaction = EEM_Transaction::instance()->get_one_by_ID($TXN_ID);
+		$query_args = isset($this->_req_data['redirect_to']) ? array(
+			'action' => $this->_req_data['redirect_to'],
+			'TXN_ID' => $this->_req_data['TXN_ID'],
+		) : array();
+		do_action(
+			'AHEE__Transactions_Admin_Page___send_payment_reminder__process_admin_payment_reminder',
+			$transaction
+		);
+		$this->_redirect_after_action(
+			false,
+			esc_html__('payment reminder', 'event_espresso'),
+			esc_html__('sent', 'event_espresso'),
+			$query_args,
+			true
+		);
+	}
+
+
+	/**
+	 *  get_transactions
+	 *    get transactions for given parameters (used by list table)
+	 *
+	 * @param  int     $perpage how many transactions displayed per page
+	 * @param  boolean $count   return the count or objects
+	 * @param string   $view
+	 * @return mixed int = count || array of transaction objects
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 */
+	public function get_transactions($perpage, $count = false, $view = '')
+	{
+
+		$TXN = EEM_Transaction::instance();
+
+		$start_date = isset($this->_req_data['txn-filter-start-date'])
+			? wp_strip_all_tags($this->_req_data['txn-filter-start-date'])
+			: date(
+				'm/d/Y',
+				strtotime('-10 year')
+			);
+		$end_date = isset($this->_req_data['txn-filter-end-date'])
+			? wp_strip_all_tags($this->_req_data['txn-filter-end-date'])
+			: date('m/d/Y');
+
+		// make sure our timestamps start and end right at the boundaries for each day
+		$start_date = date('Y-m-d', strtotime($start_date)) . ' 00:00:00';
+		$end_date = date('Y-m-d', strtotime($end_date)) . ' 23:59:59';
+
+
+		// convert to timestamps
+		$start_date = strtotime($start_date);
+		$end_date = strtotime($end_date);
+
+		// makes sure start date is the lowest value and vice versa
+		$start_date = min($start_date, $end_date);
+		$end_date = max($start_date, $end_date);
+
+		// convert to correct format for query
+		$start_date = EEM_Transaction::instance()->convert_datetime_for_query(
+			'TXN_timestamp',
+			date('Y-m-d H:i:s', $start_date),
+			'Y-m-d H:i:s'
+		);
+		$end_date = EEM_Transaction::instance()->convert_datetime_for_query(
+			'TXN_timestamp',
+			date('Y-m-d H:i:s', $end_date),
+			'Y-m-d H:i:s'
+		);
+
+
+		// set orderby
+		$this->_req_data['orderby'] = ! empty($this->_req_data['orderby']) ? $this->_req_data['orderby'] : '';
+
+		switch ($this->_req_data['orderby']) {
+			case 'TXN_ID':
+				$orderby = 'TXN_ID';
+				break;
+			case 'ATT_fname':
+				$orderby = 'Registration.Attendee.ATT_fname';
+				break;
+			case 'event_name':
+				$orderby = 'Registration.Event.EVT_name';
+				break;
+			default: // 'TXN_timestamp'
+				$orderby = 'TXN_timestamp';
+		}
+
+		$sort = ! empty($this->_req_data['order']) ? $this->_req_data['order'] : 'DESC';
+		$current_page = ! empty($this->_req_data['paged']) ? $this->_req_data['paged'] : 1;
+		$per_page = ! empty($perpage) ? $perpage : 10;
+		$per_page = ! empty($this->_req_data['perpage']) ? $this->_req_data['perpage'] : $per_page;
+
+		$offset = ($current_page - 1) * $per_page;
+		$limit = array($offset, $per_page);
+
+		$_where = array(
+			'TXN_timestamp'          => array('BETWEEN', array($start_date, $end_date)),
+			'Registration.REG_count' => 1,
+		);
+
+		if (isset($this->_req_data['EVT_ID'])) {
+			$_where['Registration.EVT_ID'] = $this->_req_data['EVT_ID'];
+		}
+
+		if (isset($this->_req_data['s'])) {
+			$search_string = '%' . $this->_req_data['s'] . '%';
+			$_where['OR'] = array(
+				'Registration.Event.EVT_name'         => array('LIKE', $search_string),
+				'Registration.Event.EVT_desc'         => array('LIKE', $search_string),
+				'Registration.Event.EVT_short_desc'   => array('LIKE', $search_string),
+				'Registration.Attendee.ATT_full_name' => array('LIKE', $search_string),
+				'Registration.Attendee.ATT_fname'     => array('LIKE', $search_string),
+				'Registration.Attendee.ATT_lname'     => array('LIKE', $search_string),
+				'Registration.Attendee.ATT_short_bio' => array('LIKE', $search_string),
+				'Registration.Attendee.ATT_email'     => array('LIKE', $search_string),
+				'Registration.Attendee.ATT_address'   => array('LIKE', $search_string),
+				'Registration.Attendee.ATT_address2'  => array('LIKE', $search_string),
+				'Registration.Attendee.ATT_city'      => array('LIKE', $search_string),
+				'Registration.REG_final_price'        => array('LIKE', $search_string),
+				'Registration.REG_code'               => array('LIKE', $search_string),
+				'Registration.REG_count'              => array('LIKE', $search_string),
+				'Registration.REG_group_size'         => array('LIKE', $search_string),
+				'Registration.Ticket.TKT_name'        => array('LIKE', $search_string),
+				'Registration.Ticket.TKT_description' => array('LIKE', $search_string),
+				'Payment.PAY_source'                  => array('LIKE', $search_string),
+				'Payment.Payment_Method.PMD_name'     => array('LIKE', $search_string),
+				'TXN_session_data'                    => array('LIKE', $search_string),
+				'Payment.PAY_txn_id_chq_nmbr'         => array('LIKE', $search_string),
+			);
+		}
+
+		// failed transactions
+		$failed = (! empty($this->_req_data['status']) && $this->_req_data['status'] === 'failed' && ! $count)
+				  || ($count && $view === 'failed');
+		$abandoned = (! empty($this->_req_data['status']) && $this->_req_data['status'] === 'abandoned' && ! $count)
+					 || ($count && $view === 'abandoned');
+		$incomplete = (! empty($this->_req_data['status']) && $this->_req_data['status'] === 'incomplete' && ! $count)
+					  || ($count && $view === 'incomplete');
+
+		if ($failed) {
+			$_where['STS_ID'] = EEM_Transaction::failed_status_code;
+		} elseif ($abandoned) {
+			$_where['STS_ID'] = EEM_Transaction::abandoned_status_code;
+		} elseif ($incomplete) {
+			$_where['STS_ID'] = EEM_Transaction::incomplete_status_code;
+		} else {
+			$_where['STS_ID'] = array('!=', EEM_Transaction::failed_status_code);
+			$_where['STS_ID*'] = array('!=', EEM_Transaction::abandoned_status_code);
+		}
+
+		$query_params = apply_filters(
+			'FHEE__Transactions_Admin_Page___get_transactions_query_params',
+			array(
+				$_where,
+				'order_by'                 => array($orderby => $sort),
+				'limit'                    => $limit,
+				'default_where_conditions' => EEM_Base::default_where_conditions_this_only,
+			),
+			$this->_req_data,
+			$view,
+			$count
+		);
+
+		$transactions = $count
+			? $TXN->count(array($query_params[0]), 'TXN_ID', true)
+			: $TXN->get_all($query_params);
+
+		return $transactions;
+	}
+
+
+	/**
+	 * @since $VID:$
+	 * @throws EE_Error
+	 * @throws InvalidArgumentException
+	 * @throws InvalidDataTypeException
+	 * @throws InvalidInterfaceException
+	 */
+	public function recalculateLineItems()
+	{
+		$TXN_ID = ! empty($this->_req_data['TXN_ID']) ? absint($this->_req_data['TXN_ID']) : false;
+		/** @var EE_Transaction $transaction */
+		$transaction = EEM_Transaction::instance()->get_one_by_ID($TXN_ID);
+		$total_line_item = $transaction->total_line_item(false);
+		if ($total_line_item instanceof EE_Line_Item) {
+			EEH_Line_Item::apply_taxes($total_line_item);
+		}
+		$this->_redirect_after_action(
+			false,
+			esc_html__('Transaction taxes and totals', 'event_espresso'),
+			esc_html__('recalculated', 'event_espresso'),
+			isset($this->_req_data['redirect_to'])
+				? array(
+				'action' => $this->_req_data['redirect_to'],
+				'TXN_ID' => $this->_req_data['TXN_ID'],
+			)
+				: array(),
+			true
+		);
+	}
 }