WC_Abstract_Order

Complexity

Total Complexity

395

Size/Duplication

Total Lines	2750
Duplicated Lines	4.44 %

Coupling/Cohesion

Components	1
Dependencies	13

162 Methods

Rating	Name	Duplication	Size	Complexity
A	__construct()	9	9	4
A	__toString()	0	3	1
A	get_meta()	0	7	3
A	get_data()	0	13	1
A	get_id()	0	3	1
A	get_order_id()	0	3	1
A	get_parent_id()	0	3	1
A	get_order_number()	0	3	1
A	get_order_key()	0	3	1
A	get_order_currency()	0	3	1
A	get_order_type()	0	3	1
A	get_date_created()	0	3	1
A	get_date_modified()	0	3	1
A	get_customer_id()	0	3	1
A	get_billing_first_name()	0	3	1
A	get_billing_last_name()	0	3	1
A	get_billing_company()	0	3	1
A	get_billing_address_1()	0	3	1
A	get_billing_address_2()	0	3	1
A	get_billing_city()	0	3	1
A	get_billing_state()	0	3	1
A	get_billing_postcode()	0	3	1
A	get_billing_country()	0	3	1
A	get_billing_email()	0	3	1
A	get_billing_phone()	0	3	1
A	get_shipping_first_name()	0	3	1
A	get_shipping_last_name()	0	3	1
A	get_shipping_company()	0	3	1
A	get_shipping_address_1()	0	3	1
A	get_shipping_address_2()	0	3	1
A	get_shipping_city()	0	3	1
A	get_shipping_state()	0	3	1
A	get_shipping_postcode()	0	3	1
A	get_shipping_country()	0	3	1
A	get_payment_method()	0	3	1
A	get_payment_method_title()	0	3	1
A	get_transaction_id()	0	3	1
A	get_customer_ip_address()	0	3	1
A	get_customer_user_agent()	0	3	1
A	get_created_via()	0	3	1
A	get_order_version()	0	3	1
A	get_prices_include_tax()	0	3	1
A	get_customer_note()	0	3	1
A	get_date_completed()	0	3	1
A	get_date_paid()	0	3	1
B	get_address()	0	30	2
A	get_status()	0	3	2
A	get_user_id()	0	3	1
A	get_user()	0	3	2
A	get_formatted_billing_address()	0	3	1
A	get_formatted_shipping_address()	0	7	3
A	get_shipping_address_map_url()	0	11	1
A	get_formatted_billing_full_name()	0	3	1
A	get_formatted_shipping_full_name()	0	3	1
A	get_discount_total()	0	10	4
A	get_discount_tax()	0	3	1
A	get_shipping_total()	0	3	1
A	get_cart_tax()	0	3	1
A	get_shipping_tax()	0	3	1
A	get_order_tax()	0	3	1
A	get_order_total()	0	3	1
A	get_total_discount()	0	8	2
A	get_total_tax()	0	3	1
A	get_total_shipping()	0	3	1
A	get_total()	0	3	1
A	get_subtotal()	0	9	3
A	get_tax_totals()	4	21	4
A	get_shipping_method()	0	7	2
A	set_order_id()	0	3	1
A	set_parent_id()	0	3	1
B	set_status()	0	19	8
A	update_status()	0	8	2
A	set_order_type()	0	3	1
A	set_order_key()	0	3	1
A	set_order_currency()	0	3	1
A	set_date_created()	0	3	2
A	set_date_modified()	0	3	2
A	set_customer_id()	0	3	1
A	set_billing_first_name()	0	3	1
A	set_billing_last_name()	0	3	1
A	set_billing_company()	0	3	1
A	set_billing_address_1()	0	3	1
A	set_billing_address_2()	0	3	1
A	set_billing_city()	0	3	1
A	set_billing_state()	0	3	1
A	set_billing_postcode()	0	3	1
A	set_billing_country()	0	3	1
A	set_billing_email()	0	4	2
A	set_billing_phone()	0	3	1
A	set_shipping_first_name()	0	3	1
A	set_shipping_last_name()	0	3	1
A	set_shipping_company()	0	3	1
A	set_shipping_address_1()	0	3	1
A	set_shipping_address_2()	0	3	1
A	set_shipping_city()	0	3	1
A	set_shipping_state()	0	3	1
A	set_shipping_postcode()	0	3	1
A	set_shipping_country()	0	3	1
A	set_discount_total()	0	3	1
A	set_discount_tax()	0	3	1
A	set_shipping_total()	0	3	1
A	set_shipping_tax()	0	4	1
A	set_cart_tax()	0	4	1
A	set_order_tax()	0	3	1
A	set_order_total()	0	3	1
A	set_payment_method()	0	8	2
A	set_payment_method_title()	0	3	1
A	set_transaction_id()	0	3	1
A	set_customer_ip_address()	0	3	1
A	set_customer_user_agent()	0	3	1
A	set_created_via()	0	3	1
A	set_order_version()	0	3	1
A	set_prices_include_tax()	0	3	1
A	set_customer_note()	0	3	1
A	set_date_completed()	0	3	2
A	set_date_paid()	0	3	2
B	create()	0	52	4
B	read()	0	71	6
B	update()	0	71	5
A	delete()	0	3	1
A	save()	0	8	2
A	get_items()	0	16	3
A	get_item()	0	3	1
A	display_item_meta()	0	5	1
A	get_fees()	0	3	1
A	get_taxes()	0	3	1
A	get_shipping_methods()	0	3	1
A	get_used_coupons()	0	3	1
A	get_item_count()	0	17	4
A	remove_order_items()	0	11	2
B	add_product()	0	24	2
F	update_product()	0	97	28
A	add_coupon()	0	13	1
D	update_coupon()	0	39	10
A	add_shipping()	0	16	1
D	update_shipping()	0	58	15
A	add_fee()	0	17	2
F	update_fee()	0	49	12
A	add_tax()	0	20	2
F	update_tax()	0	53	13
C	update_taxes()	25	42	12
A	calculate_shipping()	0	11	2
F	calculate_taxes()	20	108	20
D	calculate_totals()	0	34	9
A	get_product_from_item()	0	8	2
A	get_item_subtotal()	15	15	4
A	get_line_subtotal()	15	15	4
A	get_item_total()	15	15	4
A	get_line_total()	13	13	4
A	get_item_tax()	0	10	3
A	get_line_tax()	0	3	2
B	get_formatted_line_subtotal()	0	17	6
A	get_formatted_order_total()	0	4	1
C	get_subtotal_to_display()	0	46	11
D	get_shipping_to_display()	6	35	9
A	get_discount_to_display()	0	4	3
F	get_order_item_totals()	0	82	18
A	has_status()	0	3	4
A	has_meta()	0	7	1
A	has_shipping_method()	0	8	3
A	key_is_valid()	0	3	1
A	has_free_item()	0	8	3

<?php

For compatibility and reusability of your code, PSR1 recommends that a file should introduce either new symbols (like classes, functions, etc.) or have side-effects (like outputting something, or including other files), but not both at the same time. The first symbol is defined on line 19 and the first side effect is on line 3.

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

include_once( 'abstract-wc-legacy-order.php' );

/**
 * Abstract Order
 *
 * Handles order data and database interaction.
 *
 * @class       WC_Abstract_Order
 * @version     2.6.0
 * @package     WooCommerce/Classes
 * @category    Class
 * @author      WooThemes
 */
abstract class WC_Abstract_Order extends WC_Abstract_Legacy_Order implements WC_Data {

    /**
     * Data array, with defaults.
     *
     * @todo when migrating to custom tables, these will be columns
     * @since 2.6.0
     * @var array
     */
    protected $_data = array(
		'order_id'             => 0,
        'parent_id'            => 0,
		'status'               => '',
        /**
         * @todo confusion. Was 'simple'. But this was not the same as post_type, which is shop_order. Other post types in core are shop_order_refund
         * The order type for shop_order_refund is refund.
         * Why do we need two separate variables? This should be unified, especially once this is in a custom table and post_type is redundent.
         * Switching to 'shop_order', and then using this value in the order factory instead of post_type. @thenbrent might have feedback on this.
         */
		'order_type'           => 'shop_order',
		'order_key'            => '',
		'order_currency'       => '',
		'date_created'         => '',
		'date_modified'        => '',
		'customer_id'          => 0,
		'billing_first_name'   => '',
		'billing_last_name'    => '',
		'billing_company'      => '',
		'billing_address_1'    => '',
		'billing_address_2'    => '',
		'billing_city'         => '',
		'billing_state'        => '',
		'billing_postcode'     => '',
		'billing_country'      => '',
		'billing_email'        => '',
		'billing_phone'        => '',
		'shipping_first_name'  => '',
		'shipping_last_name'   => '',
		'shipping_company'     => '',
		'shipping_address_1'   => '',
		'shipping_address_2'   => '',
		'shipping_city'        => '',
		'shipping_state'       => '',
		'shipping_postcode'    => '',
		'shipping_country'     => '',
		'discount_total'       => 0,
		'discount_tax'         => 0,
		'shipping_total'       => 0,
		'shipping_tax'         => 0,
		'cart_tax'             => 0, // cart_tax is the new name for the legacy 'order_tax' which is the tax for items only, not shipping.
		'order_total'          => 0,
		'order_tax'            => 0, // Sum of all taxes.
    );

    /**
     * Stores meta data.
     * @var array
     */
    protected $_meta = array(
        'payment_method'       => '',
		'payment_method_title' => '',
		'transaction_id'       => '',
		'customer_ip_address'  => '',
		'customer_user_agent'  => '',
		'created_via'          => '',
		'order_version'        => '',
		'prices_include_tax'   => false,
		'customer_note'        => '',
		'date_completed'       => '',
		'date_paid'            => '',
    );

    /**
     * Stores data about status changes so relevant hooks can be fired.
     * @var bool|array
     */
    protected $_status_transition = false;

    /**
     * Get the order if ID is passed, otherwise the order is new and empty.
     * This class should NOT be instantiated, but the get_order function or new WC_Order_Factory.
     * should be used. It is possible, but the aforementioned are preferred and are the only.
     * methods that will be maintained going forward.
     *
     * @param  int|object|WC_Order $order Order to init.
     */
    public function __construct( $order = 0 ) {

This method seems to be duplicated in your project.

		if ( is_numeric( $order ) ) {
            $this->read( $order );
        } elseif ( $order instanceof WC_Order ) {
            $this->read( absint( $order->get_id() ) );
        } elseif ( ! empty( $order->ID ) ) {
            $this->read( absint( $order->ID ) );
        }
    }

    /**
     * Change data to JSON format.
     * @return string Data in JSON format.
     */
    public function __toString() {
        return json_encode( $this->get_data() );
    }

    /**
     * Get Meta Data by Key
     * @param  string $key
     * @return mixed
     */
    public function get_meta( $key = null ){
		if ( is_null( $key ) ) {
			return $this->_meta;
		} else {
        	return isset( $this->_meta[ $key ] ) ? $this->_meta[ $key ] : null;
		}
    }

    /*
    |--------------------------------------------------------------------------
    | Getters
    |--------------------------------------------------------------------------
    |
    | Methods for getting data from the order object.
    |
    */

    /**
     * Get all class data in array format.
     * @since 2.6.0
     * @return array
     */
    public function get_data() {
        return array_merge(
            $this->_data,
            $this->_meta,
            array(
                'line_items'     => $this->get_items( 'line_item' ),
                'tax_lines'      => $this->get_items( 'tax' ),
                'shipping_lines' => $this->get_items( 'shipping' ),
                'fee_lines'      => $this->get_items( 'fee' ),
                'coupon_lines'   => $this->get_items( 'coupon' ),
            )
        );
    }

    /**
     * Get order ID.
     * @since 2.6.0
     * @return integer
     */
    public function get_id() {
        return $this->get_order_id();
    }

    /**
     * Get order ID.
     * @since 2.6.0
     * @return integer
     */
    public function get_order_id() {
        return absint( $this->_data['order_id'] );
    }

    /**
     * Get parent order ID.
     * @since 2.6.0
     * @return integer
     */
    public function get_parent_id() {
        return absint( $this->_data['parent_id'] );
    }

    /**
     * get_order_number function.
     *
     * Gets the order number for display (by default, order ID).
     *
     * @return string
     */
    public function get_order_number() {
        return apply_filters( 'woocommerce_order_number', $this->get_id(), $this );
    }

    /**
     * Get order key.
     * @since 2.6.0
     * @return string
     */
    public function get_order_key() {
        return $this->_data['order_key'];
    }

    /**
     * Gets order currency.
     * @return string
     */
    public function get_order_currency() {
        return apply_filters( 'woocommerce_get_order_currency', $this->_data['order_currency'], $this );
    }

    /**
     * Get Order Type
     * @return string
     */
    public function get_order_type() {
        return $this->_data['order_type'];
    }

    /**
     * Get date_created
     * @return string
     */
    public function get_date_created() {
        return $this->_data['date_created'];
    }

    /**
     * Get date_modified
     * @return string
     */
    public function get_date_modified() {
        return $this->_data['date_modified'];
    }

    /**
     * Get customer_id
     * @return int
     */
    public function get_customer_id() {
        return absint( $this->_data['customer_id'] );
    }

    /**
     * Get billing_first_name
     * @return string
     */
    public function get_billing_first_name() {
        return $this->_data['billing_first_name'];
    }

    /**
     * Get billing_last_name
     * @return string
     */
    public function get_billing_last_name() {
        return $this->_data['billing_last_name'];
    }

    /**
     * Get billing_company
     * @return string
     */
    public function get_billing_company() {
        return $this->_data['billing_company'];
    }

    /**
     * Get billing_address_1
     * @return string
     */
    public function get_billing_address_1() {
        return $this->_data['billing_address_1'];
    }

    /**
     * Get billing_address_2
     * @return string $value
     */
    public function get_billing_address_2() {
        return $this->_data['billing_address_2'];
    }

    /**
     * Get billing_city
     * @return string $value
     */
    public function get_billing_city() {
        return $this->_data['billing_city'];
    }

    /**
     * Get billing_state
     * @return string
     */
    public function get_billing_state() {
        return $this->_data['billing_state'];
    }

    /**
     * Get billing_postcode
     * @return string
     */
    public function get_billing_postcode() {
        return $this->_data['billing_postcode'];
    }

    /**
     * Get billing_country
     * @return string
     */
    public function get_billing_country() {
        return $this->_data['billing_country'];
    }

    /**
     * Get billing_email
     * @return string
     */
    public function get_billing_email() {
        return sanitize_email( $this->_data['billing_email'] );
    }

    /**
     * Get billing_phone
     * @return string
     */
    public function get_billing_phone() {
        return $this->_data['billing_phone'];
    }

    /**
     * Get shipping_first_name
     * @return string
     */
    public function get_shipping_first_name() {
        return $this->_data['shipping_first_name'];
    }

    /**
     * Get shipping_last_name
     * @return string
     */
    public function get_shipping_last_name() {
         return $this->_data['shipping_last_name'];
    }

    /**
     * Get shipping_company
     * @return string
     */
    public function get_shipping_company() {
        return $this->_data['shipping_company'];
    }

    /**
     * Get shipping_address_1
     * @return string
     */
    public function get_shipping_address_1() {
        return $this->_data['shipping_address_1'];
    }

    /**
     * Get shipping_address_2
     * @return string
     */
    public function get_shipping_address_2() {
        return $this->_data['shipping_address_2'];
    }

    /**
     * Get shipping_city
     * @return string
     */
    public function get_shipping_city() {
        return $this->_data['shipping_city'];
    }

    /**
     * Get shipping_state
     * @return string
     */
    public function get_shipping_state() {
        return $this->_data['shipping_state'];
    }

    /**
     * Get shipping_postcode
     * @return string
     */
    public function get_shipping_postcode() {
        return $this->_data['shipping_postcode'];
    }

    /**
     * Get shipping_country
     * @return string
     */
    public function get_shipping_country() {
        return $this->_data['shipping_country'];
    }

    /**
     * Get the payment method.
     * @return string
     */
    public function get_payment_method() {
        return $this->_meta['payment_method'];
    }

    /**
     * Get payment_method_title
     * @return string
     */
    public function get_payment_method_title() {
        return $this->_meta['payment_method_title'];
    }

    /**
     * Get transaction_id
     * @return string
     */
    public function get_transaction_id() {
        return $this->_meta['transaction_id'];
    }

    /**
     * Get customer_ip_address
     * @return string
     */
    public function get_customer_ip_address() {
        return $this->_meta['customer_ip_address'];
    }

    /**
     * Get customer_user_agent
     * @return string
     */
    public function get_customer_user_agent() {
        return $this->_meta['customer_user_agent'];
    }

    /**
     * Get created_via
     * @return string
     */
    public function get_created_via() {
        return $this->_meta['created_via'];
    }

    /**
     * Get order_version
     * @return string
     */
    public function get_order_version() {
        return $this->_meta['order_version'];
    }

    /**
     * Get prices_include_tax
     * @return bool
     */
    public function get_prices_include_tax() {
        return (bool) $this->_meta['prices_include_tax'];
    }

    /**
     * Get customer_note
     * @return string
     */
    public function get_customer_note() {
        return $this->_meta['customer_note'];
    }

	/**
     * Get date_completed
     * @return string
     */
    public function get_date_completed() {
        return $this->_meta['date_completed'];
    }

	/**
     * Get date_paid
     * @return string
     */
    public function get_date_paid() {
        return $this->_meta['date_paid'];
    }

    /**
     * Returns the requested address in raw, non-formatted way.
     * @since  2.4.0
     * @param  string $type Billing or shipping. Anything else besides 'billing' will return shipping address.
     * @return array The stored address after filter.
     */
    public function get_address( $type = 'billing' ) {
        if ( 'billing' === $type ) {
            $address = array(
                'first_name' => $this->get_billing_first_name(),
                'last_name'  => $this->get_billing_last_name(),
                'company'    => $this->get_billing_company(),
                'address_1'  => $this->get_billing_address_1(),
                'address_2'  => $this->get_billing_address_2(),
                'city'       => $this->get_billing_city(),
                'state'      => $this->get_billing_state(),
                'postcode'   => $this->get_billing_postcode(),
                'country'    => $this->get_billing_country(),
                'email'      => $this->get_billing_email(),
                'phone'      => $this->get_billing_phone()
            );
        } else {
            $address = array(
                'first_name' => $this->get_shipping_first_name(),
                'last_name'  => $this->get_shipping_last_name(),
                'company'    => $this->get_shipping_company(),
                'address_1'  => $this->get_shipping_address_1(),
                'address_2'  => $this->get_shipping_address_2(),
                'city'       => $this->get_shipping_city(),
                'state'      => $this->get_shipping_state(),
                'postcode'   => $this->get_shipping_postcode(),
                'country'    => $this->get_shipping_country()
            );
        }
        return apply_filters( 'woocommerce_get_order_address', $address, $type, $this );
    }

    /**
     * Return the order statuses without wc- internal prefix.
     * @return string
     */
    public function get_status() {
        return apply_filters( 'woocommerce_order_get_status', 'wc-' === substr( $this->_data['status'], 0, 3 ) ? substr( $this->_data['status'], 3 ) : $this->_data['status'], $this );
    }

    /**
     * Alias for get_customer_id().
     * @since  2.2
     * @return int
     */
    public function get_user_id() {
        return $this->get_customer_id();
    }

    /**
     * Get the user associated with the order. False for guests.
     *
     * @since  2.2
     * @return WP_User|false
     */
    public function get_user() {
        return $this->get_user_id() ? get_user_by( 'id', $this->get_user_id() ) : false;
    }

    /**
     * Get a formatted billing address for the order.
     * @return string
     */
    public function get_formatted_billing_address() {
        return WC()->countries->get_formatted_address( apply_filters( 'woocommerce_order_formatted_billing_address', $this->get_address( 'billing' ), $this ) );
    }

    /**
     * Get a formatted shipping address for the order.
     * @return string
     */
    public function get_formatted_shipping_address() {
        if ( $this->get_shipping_address_1() || $this->get_shipping_address_2() ) {
            return WC()->countries->get_formatted_address( apply_filters( 'woocommerce_order_formatted_shipping_address', $this->get_address( 'shipping' ), $this ) );
        } else {
            return '';
        }
    }

    /**
     * Get a formatted shipping address for the order.
     *
     * @return string
     */
    public function get_shipping_address_map_url() {
        $address = apply_filters( 'woocommerce_shipping_address_map_url_parts', array(
            'address_1' => $this->get_shipping_address_1(),
            'address_2' => $this->get_shipping_address_2(),
            'city'      => $this->get_shipping_city(),
            'state'     => $this->get_shipping_state(),
            'postcode'  => $this->get_shipping_postcode(),
            'country'   => $this->get_shipping_country()
        ), $this );
        return apply_filters( 'woocommerce_shipping_address_map_url', 'http://maps.google.com/maps?&q=' . urlencode( implode( ', ', $address ) ) . '&z=16', $this );
    }

    /**
     * Get a formatted billing full name.
     *
     * @since 2.4.0
     *
     * @return string
     */
    public function get_formatted_billing_full_name() {
        return sprintf( _x( '%1$s %2$s', 'full name', 'woocommerce' ),  $this->get_billing_first_name(), $this->get_billing_last_name() );
    }

    /**
     * Get a formatted shipping full name.
     *
     * @since 2.4.0
     *
     * @return string
     */
    public function get_formatted_shipping_full_name() {
        return sprintf( _x( '%1$s %2$s', 'full name', 'woocommerce' ),  $this->get_shipping_first_name(), $this->get_shipping_last_name() );
    }

    /**
     * Get discount_total
     * @return string
     */
    public function get_discount_total() {
        $discount_total = wc_format_decimal( $this->_data['discount_total'] );

        // Backwards compatible total calculation - totals were not stored consistently in old versions.
        if ( ( ! $this->get_order_version() || version_compare( $this->get_order_version(), '2.3.7', '<' ) ) && $this->get_prices_include_tax() ) {
            $discount_total = $discount_total - $this->get_discount_tax();
        }

        return $discount_total;
    }

    /**
     * Get discount_tax
     * @return string
     */
    public function get_discount_tax() {
        return wc_format_decimal( $this->_data['discount_tax'] );
    }

    /**
     * Get shipping_total
     * woocommerce_order_amount_total_shipping filter has been removed to avoid
     * these values being modified and then saved back to the DB. There are
     * other, later hooks available to change totals on display. e.g.
     * woocommerce_get_order_item_totals.
     * @return string
     */
    public function get_shipping_total() {
        return wc_format_decimal( $this->_data['shipping_total'] );
    }

    /**
     * Gets cart tax amount.
     *
     * @since 2.6.0 woocommerce_order_amount_cart_tax filter has been removed to avoid
     * these values being modified and then saved back to the DB or used in
     * calculations. There are other, later hooks available to change totals on
     * display. e.g. woocommerce_get_order_item_totals.
     * @return float
     */
    public function get_cart_tax() {
        return wc_format_decimal( $this->_data['cart_tax'] );
    }

    /**
     * Get shipping_tax.
     *
     * @since 2.6.0 woocommerce_order_amount_shipping_tax filter has been removed to avoid
     * these values being modified and then saved back to the DB or used in
     * calculations. There are other, later hooks available to change totals on
     * display. e.g. woocommerce_get_order_item_totals.
     * @return string
     */
    public function get_shipping_tax() {
        return wc_format_decimal( $this->_data['shipping_tax'] );
    }

    /**
     * Order tax is the sum of all taxes.
     * @return string
     */
    public function get_order_tax() {
        return wc_round_tax_total( $this->_data['order_tax'] );
    }

    /**
     * Get the stored order total. Includes taxes and everything else.
     * @return string
     */
    public function get_order_total() {
        return wc_format_decimal( $this->_data['order_total'], wc_get_price_decimals() );
    }

    /**
     * Gets the total discount amount.
     * @param  bool $ex_tax Show discount excl any tax.
     * @return float
     */
    public function get_total_discount( $ex_tax = true ) {
        if ( $ex_tax ) {
            $total_discount = $this->get_discount_total();
        } else {
            $total_discount = $this->get_discount_total() + $this->get_discount_tax();
        }
        return apply_filters( 'woocommerce_order_amount_total_discount', round( $total_discount, WC_ROUNDING_PRECISION ), $this );
    }

    /**
     * Get total tax amount. Alias for get_order_tax().
     *
     * @since 2.6.0 woocommerce_order_amount_total_tax filter has been removed to avoid
     * these values being modified and then saved back to the DB. There are
     * other, later hooks available to change totals on display. e.g.
     * woocommerce_get_order_item_totals.
     * @return float
     */
    public function get_total_tax() {
        return $this->get_order_tax();
    }

    /**
     * Gets shipping total. Alias of WC_Order::get_shipping_total().
     *
     * @since 2.6.0 woocommerce_order_amount_total_shipping filter has been removed to avoid
     * these values being modified and then saved back to the DB or used in
     * calculations. There are other, later hooks available to change totals on
     * display. e.g. woocommerce_get_order_item_totals.
     * @return float
     */
    public function get_total_shipping() {
        return $this->get_shipping_total();
    }

    /**
     * Gets order grand total. incl. taxes. Used in gateways. Filtered.
     * @return float
     */
    public function get_total() {
        return apply_filters( 'woocommerce_order_amount_total', $this->get_order_total(), $this );
    }

    /**
     * Gets order subtotal.
     * @return float
     */
    public function get_subtotal() {
        $subtotal = 0;

        foreach ( $this->get_items() as $item ) {
            $subtotal += isset( $item['line_subtotal'] ) ? $item['line_subtotal'] : 0;
        }

        return apply_filters( 'woocommerce_order_amount_subtotal', (double) $subtotal, $this );
    }

    /**
     * Get taxes, merged by code, formatted ready for output.
     *
     * @return array
     */
    public function get_tax_totals() {
        $tax_totals = array();

        foreach ( $this->get_items( 'tax' ) as $key => $tax ) {
            $code = $tax[ 'name' ];

            if ( ! isset( $tax_totals[ $code ] ) ) {

This code seems to be duplicated across your project.

                $tax_totals[ $code ] = new stdClass();
                $tax_totals[ $code ]->amount = 0;
            }

            $tax_totals[ $code ]->id                = $key;
            $tax_totals[ $code ]->rate_id           = $tax['rate_id'];
            $tax_totals[ $code ]->is_compound       = $tax[ 'compound' ];
            $tax_totals[ $code ]->label             = isset( $tax[ 'label' ] ) ? $tax[ 'label' ] : $tax[ 'name' ];
            $tax_totals[ $code ]->amount           += $tax[ 'tax_amount' ] + $tax[ 'shipping_tax_amount' ];
            $tax_totals[ $code ]->formatted_amount  = wc_price( wc_round_tax_total( $tax_totals[ $code ]->amount ), array('currency' => $this->get_order_currency()) );
        }

        return apply_filters( 'woocommerce_order_tax_totals', $tax_totals, $this );
    }

    /**
     * Gets formatted shipping method title.
     * @return string
     */
    public function get_shipping_method() {
        $names = array();
        foreach ( $this->get_shipping_methods() as $shipping_method ) {
            $names[] = $shipping_method->get_name();
        }
        return apply_filters( 'woocommerce_order_shipping_method', implode( ', ', $names ), $this );
    }

    /*
    |--------------------------------------------------------------------------
    | Setters
    |--------------------------------------------------------------------------
    |
    | Functions for setting order data. These should not update anything in the
    | database itself and should only change what is stored in the class
    | object. However, for backwards compatibility pre 2.6.0 some of these
    | setters may handle both.
    |
    */

    /**
     * Set order ID.
     * @since 2.6.0
     * @param int $value
     */
    public function set_order_id( $value ) {
        $this->_data['order_id'] = absint( $value );
    }

    /**
     * Set parent order ID.
     * @since 2.6.0
     * @param int $value
     */
    public function set_parent_id( $value ) {
        $this->_data['parent_id'] = absint( $value );
    }

    /**
     * Set order status.
     * @since 2.6.0
     * @param string $new_status Status to change the order to. No internal wc- prefix is required.
     * @param string $note (default: '') Optional note to add.
     * @param bool $manual is this a manual order status change?

There is no parameter named $manual. Did you maybe mean $manual_update?

     */
    public function set_status( $new_status, $note = '', $manual_update = false ) {
        // Remove prefixes and standardize
        $current_status = $this->get_status();
        $new_status     = 'wc-' === substr( $new_status, 0, 3 ) ? substr( $new_status, 3 ) : $new_status;

        if ( in_array( 'wc-' . $new_status, array_keys( wc_get_order_statuses() ) ) && $new_status !== $current_status ) {
            if ( ! empty( $current_status ) ) {
                $this->_status_transition = array(
                    'original' => ! empty( $this->_status_transition['original'] ) ? $this->_status_transition['original'] : $current_status,
                    'note'     => $note ? $note : '',
                    'manual'   => (bool) $manual_update
                );
				if ( 'completed' === $new_status ) {
					$this->set_date_completed( current_time( 'timestamp' ) );
				}
            }
            $this->_data['status'] = 'wc-' . $new_status;
        }
    }

	/**
     * Updates status of order immediately.
     * @uses WC_Order::set_status()
     */
    public function update_status( $new_status, $note = '', $manual = false ) {
        if ( ! $this->get_id() ) {
            return false;
        }
		$this->set_status( $new_status, $note, $manual );
		$this->save();
        return true;
    }

    /**
     * Set Order Type
     * @param string $value
     */
    public function set_order_type( $value ) {
        $this->_data['order_type'] = $value;
    }

    /**
     * Set order_key
     * @param string $value
     */
    public function set_order_key( $value ) {
        $this->_data['order_key'] = $value;
    }

    /**
     * Set order_currency
     * @param string $value
     */
    public function set_order_currency( $value ) {
        $this->_data['order_currency'] = $value;
    }

    /**
     * Set date_created
     * @param string $timestamp Timestamp
     */
    public function set_date_created( $timestamp ) {
        $this->_data['date_created'] = is_numeric( $timestamp ) ? $timestamp : strtotime( $timestamp );
    }

    /**
     * Set date_modified
     * @param string $timestamp
     */
    public function set_date_modified( $timestamp ) {
        $this->_data['date_modified'] = is_numeric( $timestamp ) ? $timestamp : strtotime( $timestamp );
    }

    /**
     * Set customer_id
     * @param int $value
     */
    public function set_customer_id( $value ) {
        $this->_data['customer_id'] = absint( $value );
    }

    /**
     * Set billing_first_name
     * @param string $value
     */
    public function set_billing_first_name( $value ) {
        $this->_data['billing_first_name'] = $value;
    }

    /**
     * Set billing_last_name
     * @param string $value
     */
    public function set_billing_last_name( $value ) {
        $this->_data['billing_last_name'] = $value;
    }

    /**
     * Set billing_company
     * @param string $value
     */
    public function set_billing_company( $value ) {
        $this->_data['billing_company'] = $value;
    }

    /**
     * Set billing_address_1
     * @param string $value
     */
    public function set_billing_address_1( $value ) {
        $this->_data['billing_address_1'] = $value;
    }

    /**
     * Set billing_address_2
     * @param string $value
     */
    public function set_billing_address_2( $value ) {
        $this->_data['billing_address_2'] = $value;
    }

    /**
     * Set billing_city
     * @param string $value
     */
    public function set_billing_city( $value ) {
        $this->_data['billing_city'] = $value;
    }

    /**
     * Set billing_state
     * @param string $value
     */
    public function set_billing_state( $value ) {
        $this->_data['billing_state'] = $value;
    }

    /**
     * Set billing_postcode
     * @param string $value
     */
    public function set_billing_postcode( $value ) {
        $this->_data['billing_postcode'] = $value;
    }

    /**
     * Set billing_country
     * @param string $value
     */
    public function set_billing_country( $value ) {
        $this->_data['billing_country'] = $value;
    }

    /**
     * Set billing_email
     * @param string $value
     */
    public function set_billing_email( $value ) {
		$value = sanitize_email( $value );
        $this->_data['billing_email'] = is_email( $value ) ? $value : '';
    }

    /**
     * Set billing_phone
     * @param string $value
     */
    public function set_billing_phone( $value ) {
        $this->_data['billing_phone'] = $value;
    }

    /**
     * Set shipping_first_name
     * @param string $value
     */
    public function set_shipping_first_name( $value ) {
        $this->_data['shipping_first_name'] = $value;
    }

    /**
     * Set shipping_last_name
     * @param string $value
     */
    public function set_shipping_last_name( $value ) {
        $this->_data['shipping_last_name'] = $value;
    }

    /**
     * Set shipping_company
     * @param string $value
     */
    public function set_shipping_company( $value ) {
        $this->_data['shipping_company'] = $value;
    }

    /**
     * Set shipping_address_1
     * @param string $value
     */
    public function set_shipping_address_1( $value ) {
        $this->_data['shipping_address_1'] = $value;
    }

    /**
     * Set shipping_address_2
     * @param string $value
     */
    public function set_shipping_address_2( $value ) {
        $this->_data['shipping_address_2'] = $value;
    }

    /**
     * Set shipping_city
     * @param string $value
     */
    public function set_shipping_city( $value ) {
        $this->_data['shipping_city'] = $value;
    }

    /**
     * Set shipping_state
     * @param string $value
     */
    public function set_shipping_state( $value ) {
        $this->_data['shipping_state'] = $value;
    }

    /**
     * Set shipping_postcode
     * @param string $value
     */
    public function set_shipping_postcode( $value ) {
        $this->_data['shipping_postcode'] = $value;
    }

    /**
     * Set shipping_country
     * @param string $value
     */
    public function set_shipping_country( $value ) {
        $this->_data['shipping_country'] = $value;
    }

    /**
     * Set discount_total
     * @param string $value
     */
    public function set_discount_total( $value ) {
        $this->_data['discount_total'] = wc_format_decimal( $value );
    }

    /**
     * Set discount_tax
     * @param string $value
     */
    public function set_discount_tax( $value ) {
        $this->_data['discount_tax'] = wc_format_decimal( $value );
    }

    /**
     * Set shipping_total
     * @param string $value
     */
    public function set_shipping_total( $value ) {
        $this->_data['shipping_total'] = wc_format_decimal( $value );
    }

    /**
     * Set shipping_tax
     * @param string $value
     */
    public function set_shipping_tax( $value ) {
        $this->_data['shipping_tax'] = wc_format_decimal( $value );
        $this->set_order_tax( $this->get_cart_tax() + $this->get_shipping_tax() );
    }

    /**
     * Set cart tax
     * @param string $value
     */
    public function set_cart_tax( $value ) {
        $this->_data['cart_tax'] = wc_format_decimal( $value );
        $this->set_order_tax( $this->get_cart_tax() + $this->get_shipping_tax() );
    }

    /**
     * Sets order tax (sum of cart and shipping tax). Used internaly only.
     * @access protected
     * @param string $value
     */
    protected function set_order_tax( $value ) {
        $this->_data['order_tax'] = wc_format_decimal( $value );
    }

    /**
     * Set order_total
     * @param string $value
     */
    public function set_order_total( $value ) {
        $this->_data['order_total'] = wc_format_decimal( $value, wc_get_price_decimals() );
    }

    /**
     * Set the payment method.
     * @since 2.2.0
     * @param string $value Supports WC_Payment_Gateway for bw compatibility with < 2.6
     */
    public function set_payment_method( $value ) {
        if ( is_object( $value ) ) {
            $this->set_payment_method( $value->id );
            $this->set_payment_method_title( $value->get_title() );
        } else {
            $this->_meta['payment_method'] = $value;
        }
    }

    /**
     * Set payment_method_title
     * @param string $value
     */
    public function set_payment_method_title( $value ) {
        $this->_meta['payment_method_title'] = $value;
    }

    /**
     * Set transaction_id
     * @param string $value
     */
    public function set_transaction_id( $value ) {
        $this->_meta['transaction_id'] = $value;
    }

    /**
     * Set customer_ip_address
     * @param string $value
     */
    public function set_customer_ip_address( $value ) {
        $this->_meta['customer_ip_address'] = $value;
    }

    /**
     * Set customer_user_agent
     * @param string $value
     */
    public function set_customer_user_agent( $value ) {
        $this->_meta['customer_user_agent'] = $value;
    }

    /**
     * Set created_via
     * @param string $value
     */
    public function set_created_via( $value ) {
        $this->_meta['created_via'] = $value;
    }

    /**
     * Set order_version
     * @param string $value
     */
    public function set_order_version( $value ) {
        $this->_meta['order_version'] = $value;
    }

    /**
     * Set prices_include_tax
     * @param bool $value
     */
    public function set_prices_include_tax( $value ) {
        $this->_meta['prices_include_tax'] = (bool) $value;
    }

    /**
     * Set customer_note
     * @param string $value
     */
    public function set_customer_note( $value ) {
        $this->_meta['customer_note'] = $value;
    }

	/**
     * Set date_completed
     * @param string $timestamp
     */
    public function set_date_completed( $timestamp ) {
        $this->_meta['date_completed'] = is_numeric( $timestamp ) ? $timestamp : strtotime( $timestamp );
    }

	/**
     * Set date_paid
     * @param string $timestamp
     */
    public function set_date_paid( $timestamp ) {
        $this->_meta['date_paid'] = is_numeric( $timestamp ) ? $timestamp : strtotime( $timestamp );
    }

    /*
    |--------------------------------------------------------------------------
    | CRUD methods
    |--------------------------------------------------------------------------
    |
    | Methods which create, read, update and delete orders from the database.
    | Written in abstract fashion so that the way orders are stored can be
    | changed more easily in the future.
    |
    | A save method is included for convenience (chooses update or create based
    | on if the order exists yet).
    |
    */

    /**
     * Insert data into the database.
     * @since 2.6.0
     * @access protected
     */
    public function create() {
        // Set random key
        $this->set_order_key( uniqid( 'order_' ) );

        $order_id = wp_insert_post( apply_filters( 'woocommerce_new_order_data', array(
            'post_type'     => $this->get_order_type(),
            'post_status'   => 'wc-' . ( $this->get_status() ? $this->get_status() : apply_filters( 'woocommerce_default_order_status', 'pending' ) ),
            'ping_status'   => 'closed',
            'post_author'   => 1,
            'post_title'    => sprintf( __( 'Order &ndash; %s', 'woocommerce' ), strftime( _x( '%b %d, %Y @ %I:%M %p', 'Order date parsed by strftime', 'woocommerce' ) ) ),
            'post_password' => $this->get_order_key(),
            'post_parent'   => $this->get_parent_id()
        ) ), true );

        if ( $order_id ) {
            $this->set_order_id( $order_id );

            // Set meta data
            update_post_meta( $order_id, '_billing_first_name', $this->get_billing_first_name() );
            update_post_meta( $order_id, '_billing_last_name', $this->get_billing_last_name() );
            update_post_meta( $order_id, '_billing_company', $this->get_billing_company() );
            update_post_meta( $order_id, '_billing_address_1', $this->get_billing_address_1() );
            update_post_meta( $order_id, '_billing_address_2', $this->get_billing_address_2() );
            update_post_meta( $order_id, '_billing_city', $this->get_billing_city() );
            update_post_meta( $order_id, '_billing_state', $this->get_billing_state() );
            update_post_meta( $order_id, '_billing_postcode', $this->get_billing_postcode() );
            update_post_meta( $order_id, '_billing_country', $this->get_billing_country() );
            update_post_meta( $order_id, '_billing_email', $this->get_billing_email() );
            update_post_meta( $order_id, '_billing_phone', $this->get_billing_phone() );
            update_post_meta( $order_id, '_shipping_first_name', $this->get_shipping_first_name() );
            update_post_meta( $order_id, '_shipping_last_name', $this->get_shipping_last_name() );
            update_post_meta( $order_id, '_shipping_company', $this->get_shipping_company() );
            update_post_meta( $order_id, '_shipping_address_1', $this->get_shipping_address_1() );
            update_post_meta( $order_id, '_shipping_address_2', $this->get_shipping_address_2() );
            update_post_meta( $order_id, '_shipping_city', $this->get_shipping_city() );
            update_post_meta( $order_id, '_shipping_state', $this->get_shipping_state() );
            update_post_meta( $order_id, '_shipping_postcode', $this->get_shipping_postcode() );
            update_post_meta( $order_id, '_shipping_country', $this->get_shipping_country() );
            update_post_meta( $order_id, '_order_currency', $this->get_order_currency() );
            update_post_meta( $order_id, '_order_key', $this->get_order_key() );
            update_post_meta( $order_id, '_cart_discount', $this->get_discount_total() );
            update_post_meta( $order_id, '_cart_discount_tax', $this->get_discount_tax() );
            update_post_meta( $order_id, '_order_shipping', $this->get_shipping_total() );
            update_post_meta( $order_id, '_order_shipping_tax', $this->get_shipping_tax() );
            update_post_meta( $order_id, '_order_tax', $this->get_cart_tax() );
            update_post_meta( $order_id, '_order_total', $this->get_order_total() );

			foreach ( $this->get_meta() as $key => $value ) {
				update_post_meta( $order_id, '_' . $key, $value );
			}
        }
    }

    /**
     * Read from the database.
     * @since 2.6.0
     * @param int $id ID of object to read.
     */
    public function read( $id ) {
        $post_object = get_post( $id );
        $order_id    = absint( $post_object->ID );

        // Map standard post data
        $this->set_order_id( $order_id );
        $this->set_date_created( $post_object->post_date );
        $this->set_date_modified( $post_object->post_modified );
        $this->set_status( $post_object->post_status );
        $this->set_customer_note( $post_object->post_excerpt );

        // Map meta data
        $this->set_customer_id( get_post_meta( $order_id, '_customer_user', true ) );
        $this->set_order_key( get_post_meta( $order_id, '_order_key', true ) );
        $this->set_order_currency( get_post_meta( $order_id, '_order_currency', true ) );
        $this->set_billing_first_name( get_post_meta( $order_id, '_billing_first_name', true ) );
        $this->set_billing_last_name( get_post_meta( $order_id, '_billing_last_name', true ) );
        $this->set_billing_company( get_post_meta( $order_id, '_billing_company', true ) );
        $this->set_billing_address_1( get_post_meta( $order_id, '_billing_address_1', true ) );
        $this->set_billing_address_2( get_post_meta( $order_id, '_billing_address_2', true ) );
        $this->set_billing_city( get_post_meta( $order_id, '_billing_city', true ) );
        $this->set_billing_state( get_post_meta( $order_id, '_billing_state', true ) );
        $this->set_billing_postcode( get_post_meta( $order_id, '_billing_postcode', true ) );
        $this->set_billing_country( get_post_meta( $order_id, '_billing_country', true ) );
        $this->set_billing_email( get_post_meta( $order_id, '_billing_email', true ) );
        $this->set_billing_phone( get_post_meta( $order_id, '_billing_phone', true ) );
        $this->set_shipping_first_name( get_post_meta( $order_id, '_shipping_first_name', true ) );
        $this->set_shipping_last_name( get_post_meta( $order_id, '_shipping_last_name', true ) );
        $this->set_shipping_company( get_post_meta( $order_id, '_shipping_company', true ) );
        $this->set_shipping_address_1( get_post_meta( $order_id, '_shipping_address_1', true ) );
        $this->set_shipping_address_2( get_post_meta( $order_id, '_shipping_address_2', true ) );
        $this->set_shipping_city( get_post_meta( $order_id, '_shipping_city', true ) );
        $this->set_shipping_state( get_post_meta( $order_id, '_shipping_state', true ) );
        $this->set_shipping_postcode( get_post_meta( $order_id, '_shipping_postcode', true ) );
        $this->set_shipping_country( get_post_meta( $order_id, '_shipping_country', true ) );

		// Map totals
        $this->set_discount_total( get_post_meta( $order_id, '_cart_discount', true ) );
        $this->set_discount_tax( get_post_meta( $order_id, '_cart_discount_tax', true ) );
        $this->set_shipping_total( get_post_meta( $order_id, '_order_shipping', true ) );
        $this->set_shipping_tax( get_post_meta( $order_id, '_order_shipping_tax', true ) );
        $this->set_cart_tax( get_post_meta( $order_id, '_order_tax', true ) );
        $this->set_order_total( get_post_meta( $order_id, '_order_total', true ) );

        // Map user data
        if ( empty( $this->get_billing_email() ) && ( $user = $this->get_user() ) ) {
            $this->set_billing_email( $user->user_email );
        }

        // This is meta data, but due to the keys not matching the props, load here
		$this->set_date_completed( get_post_meta( $order_id, '_completed_date', true ) );
		$this->set_date_paid( get_post_meta( $order_id, '_paid_date', true ) );

		// Load meta data, including anything custom set.
		$ignore_keys = array( '_customer_user', '_order_key', '_order_currency', '_billing_first_name', '_billing_last_name', '_billing_company', '_billing_address_1', '_billing_address_2', '_billing_city', '_billing_state', '_billing_postcode', '_billing_country', '_billing_email', '_billing_phone', '_shipping_first_name', '_shipping_last_name', '_shipping_company', '_shipping_address_1', '_shipping_address_2', '_shipping_city', '_shipping_state', '_shipping_postcode', '_shipping_country', '_completed_date', '_paid_date', '_edit_lock', '_cart_discount', '_cart_discount_tax', '_order_shipping', '_order_shipping_tax', '_order_tax', '_order_total', '_order_total' );
		$meta_data   = get_post_meta( $order_id );
		$meta_data   = array_diff_key( $meta_data, array_fill_keys( $ignore_keys, '' ) );

		// Set meta data. Remove _ from key for hidden meta.
		foreach ( $meta_data as $key => $value ) {
			$key = ltrim( $key, '_' );
			if ( is_callable( array( $this, "set_$key" ) ) ) {
				$this->{"set_$key"}( $value[0] );
			} else {
				$this->_meta[ $key ] = $value[0];
			}
		}

        // Orders store the state of prices including tax when created.
        $this->prices_include_tax = metadata_exists( 'post', $order_id, '_prices_include_tax' ) ? 'yes' === get_post_meta( $order_id, '_prices_include_tax', true ) : 'yes' === get_option( 'woocommerce_prices_include_tax' );
    }

    /**
     * Update data in the database.
     * @since 2.6.0
     * @access protected
     */
    public function update() {
        global $wpdb;

        $order_id = $this->get_id();

        $wpdb->update(
            $wpdb->posts,
            array(
                'post_date'     => date( 'Y-m-d H:i:s', $this->get_date_created() ),
                'post_date_gmt' => get_gmt_from_date( date( 'Y-m-d H:i:s', $this->get_date_created() ) ),
                'post_status'   => 'wc-' . ( $this->get_status() ? $this->get_status() : apply_filters( 'woocommerce_default_order_status', 'pending' ) ),
                'post_parent'   => $this->get_parent_id()
            ),
            array(
                'ID' => $order_id
            )
        );

        // Update meta data
        update_post_meta( $order_id, '_billing_first_name', $this->get_billing_first_name() );
        update_post_meta( $order_id, '_billing_last_name', $this->get_billing_last_name() );
        update_post_meta( $order_id, '_billing_company', $this->get_billing_company() );
        update_post_meta( $order_id, '_billing_address_1', $this->get_billing_address_1() );
        update_post_meta( $order_id, '_billing_address_2', $this->get_billing_address_2() );
        update_post_meta( $order_id, '_billing_city', $this->get_billing_city() );
        update_post_meta( $order_id, '_billing_state', $this->get_billing_state() );
        update_post_meta( $order_id, '_billing_postcode', $this->get_billing_postcode() );
        update_post_meta( $order_id, '_billing_country', $this->get_billing_country() );
        update_post_meta( $order_id, '_billing_email', $this->get_billing_email() );
        update_post_meta( $order_id, '_billing_phone', $this->get_billing_phone() );
        update_post_meta( $order_id, '_shipping_first_name', $this->get_shipping_first_name() );
        update_post_meta( $order_id, '_shipping_last_name', $this->get_shipping_last_name() );
        update_post_meta( $order_id, '_shipping_company', $this->get_shipping_company() );
        update_post_meta( $order_id, '_shipping_address_1', $this->get_shipping_address_1() );
        update_post_meta( $order_id, '_shipping_address_2', $this->get_shipping_address_2() );
        update_post_meta( $order_id, '_shipping_city', $this->get_shipping_city() );
        update_post_meta( $order_id, '_shipping_state', $this->get_shipping_state() );
        update_post_meta( $order_id, '_shipping_postcode', $this->get_shipping_postcode() );
        update_post_meta( $order_id, '_shipping_country', $this->get_shipping_country() );
        update_post_meta( $order_id, '_order_currency', $this->get_order_currency() );
        update_post_meta( $order_id, '_order_key', $this->get_order_key() );
        update_post_meta( $order_id, '_cart_discount', $this->get_discount_total() );
        update_post_meta( $order_id, '_cart_discount_tax', $this->get_discount_tax() );
        update_post_meta( $order_id, '_order_shipping', $this->get_shipping_total() );
        update_post_meta( $order_id, '_order_shipping_tax', $this->get_shipping_tax() );
        update_post_meta( $order_id, '_order_tax', $this->get_cart_tax() );
        update_post_meta( $order_id, '_order_total', $this->get_order_total() );

		foreach ( $this->get_meta() as $key => $value ) {
			update_post_meta( $order_id, '_' . $key, $value );
		}

        if ( $this->_status_transition ) {
            if ( ! empty( $this->_status_transition['original'] ) ) {
                $transition_note = sprintf( __( 'Order status changed from %s to %s.', 'woocommerce' ), wc_get_order_status_name( $this->_status_transition['original'] ), wc_get_order_status_name( $this->get_status() ) );

                do_action( 'woocommerce_order_status_' . $this->_status_transition['original'] . '_to_' . $this->get_status(), $this->get_id() );
                do_action( 'woocommerce_order_status_changed', $this->get_id(), $this->_status_transition['original'], $this->get_status() );
            } else {
                $transition_note = sprintf( __( 'Order status set to %s.', 'woocommerce' ), wc_get_order_status_name( $this->get_status() ) );
            }

            do_action( 'woocommerce_order_status_' . $this->get_status(), $this->get_id() );

            // Note the transition occured
            $this->add_order_note( trim( $this->_status_transition['note'] . ' ' . $transition_note ), 0, $this->_status_transition['manual'] );

It seems like you code against a specific sub-type and not the parent class WC_Abstract_Order as the method add_order_note() does only exist in the following sub-classes of WC_Abstract_Order: WC_Order. Maybe you want to instanceof check for one of these explicitly?

            // This has ran, so reset status transition variable
            $this->_status_transition = false;
        }
    }

    /**
     * Delete data from the database.
     * @since 2.6.0
     */
    public function delete() {
        wp_delete_post( $this->get_id() );
    }

    /**
     * Save data to the database.
     * @since 2.6.0
     * @access protected
     */
    public function save() {
        if ( ! $this->get_id() ) {
            $this->create();
        } else {
            $this->update();
        }
        wc_delete_shop_order_transients( $this->get_id() );
    }

    /*
    |--------------------------------------------------------------------------
    | Order Item Handling
    |--------------------------------------------------------------------------
    |
    | Order items are used for products, taxes, shipping, and fees within
    | each order.
    |
    */

    /**
     * Return an array of items/products within this order.
     *
     * @param string|array $type Types of line items to get (array or string).
     * @return Array of WC_Order_item
     */
    public function get_items( $type = 'line_item' ) {
        global $wpdb;

        $type            = ! is_array( $type ) ? array( $type ) : $type;
        $items           = array();
        $get_items_sql   = $wpdb->prepare( "SELECT * FROM {$wpdb->prefix}woocommerce_order_items WHERE order_id = %d ", $this->get_id() );
        $get_items_sql  .= "AND order_item_type IN ( '" . implode( "','", array_map( 'esc_sql', $type ) ) . "' ) ORDER BY order_item_id;";
        $raw_items       = $wpdb->get_results( $get_items_sql );

        foreach ( $raw_items as $item ) {
            $item                                = $this->get_item( $item );
            $items[ $item->get_order_item_id() ] = $item;
        }

        return apply_filters( 'woocommerce_order_get_items', $items, $this );
    }

    /**
     * Get an order item object, based on it's type.
     * @param  int $item_id
     * @return WC_Order_Item
     */
    public function get_item( $item_id ) {
        return WC_Order_Factory::get_order_item( $item_id );
    }

    /**
     * Display meta data belonging to an item. @todo
     * @param  array $item
     */
    public function display_item_meta( $item ) {
        $product   = $this->get_product_from_item( $item );

$item is of type array, but the function expects a object.

        $item_meta = new WC_Order_Item_Meta( $item, $product );

It seems like $product defined by $this->get_product_from_item($item) on line 1527 can also be of type boolean; however, WC_Order_Item_Meta::__construct() does only seem to accept object<WC_Product>|null, maybe add an additional type check?

        $item_meta->display();
    }

    /**
     * Return an array of fees within this order.
     *
     * @return array
     */
    public function get_fees() {
        return $this->get_items( 'fee' );
    }

    /**
     * Return an array of taxes within this order.
     *
     * @return array
     */
    public function get_taxes() {
        return $this->get_items( 'tax' );
    }

    /**
     * Return an array of shipping costs within this order.
     *
     * @return array
     */
    public function get_shipping_methods() {
        return $this->get_items( 'shipping' );
    }

    /**
     * Get coupon codes only.
     *
     * @return array
     */
    public function get_used_coupons() {
        return array_map( 'trim', wp_list_pluck( $this->get_items( 'coupon' ), 'name' ) );
    }

    /**
     * Gets the count of order items of a certain type.
     *
     * @param string $item_type
     * @return string
     */
    public function get_item_count( $item_type = '' ) {
        if ( empty( $item_type ) ) {
            $item_type = array( 'line_item' );
        }
        if ( ! is_array( $item_type ) ) {
            $item_type = array( $item_type );
        }

        $items = $this->get_items( $item_type );
        $count = 0;

        foreach ( $items as $item ) {
            $count += $item->get_qty();
        }

        return apply_filters( 'woocommerce_get_item_count', $count, $item_type, $this );
    }

    /**
     * Remove all line items (products, coupons, shipping, taxes) from the order.
     *
     * @param string $type Order item type. Default null.
     */
    public function remove_order_items( $type = null ) {
        global $wpdb;

        if ( ! empty( $type ) ) {
            $wpdb->query( $wpdb->prepare( "DELETE FROM itemmeta USING {$wpdb->prefix}woocommerce_order_itemmeta itemmeta INNER JOIN {$wpdb->prefix}woocommerce_order_items items WHERE itemmeta.order_item_id = items.order_item_id AND items.order_id = %d AND items.order_item_type = %s", $this->get_id(), $type ) );
            $wpdb->query( $wpdb->prepare( "DELETE FROM {$wpdb->prefix}woocommerce_order_items WHERE order_id = %d AND order_item_type = %s", $this->get_id(), $type ) );
        } else {
            $wpdb->query( $wpdb->prepare( "DELETE FROM itemmeta USING {$wpdb->prefix}woocommerce_order_itemmeta itemmeta INNER JOIN {$wpdb->prefix}woocommerce_order_items items WHERE itemmeta.order_item_id = items.order_item_id and items.order_id = %d", $this->get_id() ) );
            $wpdb->query( $wpdb->prepare( "DELETE FROM {$wpdb->prefix}woocommerce_order_items WHERE order_id = %d", $this->get_id() ) );
        }
    }

    /**
     * Add a product line item to the order.
     * Order must be saved prior to adding items.
     *
     * @since 2.2
     * @param \WC_Product $product
     * @param int $qty Line item quantity.
     * @param array $args
     * @return int updated order item ID
     */
    public function add_product( $product, $qty = 1, $args = array() ) {
        $args = wp_parse_args( $args, array(
            'name'         => $product->get_title(),
            'qty'          => absint( $qty ),
            'tax_class'    => $product->get_tax_class(),
            'product_id'   => $product->id,
            'variation_id' => isset( $product->variation_id ) ? $product->variation_id : 0,
            'variation'    => array(),
            'subtotal'     => $product->get_price_excluding_tax( $qty ),
            'subtotal_tax' => 0,
            'total'        => $product->get_price_excluding_tax( $qty ),
            'total_tax'    => 0,
            'taxes'        => array(
                'subtotal' => array(),
                'total'    => array()
            )
        ) );
        $item = new WC_Order_Item_Product();
        $item_id = $this->update_product( $item, $product, $args );

		do_action( 'woocommerce_order_add_product', $this->get_id(), $item->get_order_item_id(), $product, $qty, $args );

		return $item_id;
    }

    /**
     * Update a line item for the order.
     *
     * Note this does not update order totals.
     *
     * @since 2.2
     * @param object|int $item order item ID or item object.
     * @param WC_Product $product
     * @param array $args data to update.
     * @return int updated order item ID
     */
    public function update_product( $item, $product, $args ) {
        if ( is_numeric( $item ) ) {
            $item = $this->get_item( $item );
        }

        if ( ! is_object( $product ) || ! $item->is_type( 'line_item' ) ) {
            return false;
        }

        if ( ! $this->get_id() ) {
            $this->save();
        }

		$item->set_order_id( $this->get_id() );

        if ( ! $item->get_order_item_id() ) {
            $inserting = true;
        } else {
            $inserting = false;
        }

        if ( isset( $args['name'] ) ) {
            $item->set_name( $args['name'] );
        }

        if ( isset( $args['qty'] ) ) {
            $item->set_qty( $args['qty'] );

            if ( $product->backorders_require_notification() && $product->is_on_backorder( $args['qty'] ) ) {
                $item->add_meta_data( apply_filters( 'woocommerce_backordered_item_meta_name', __( 'Backordered', 'woocommerce' ) ), $args['qty'] - max( 0, $product->get_total_stock() ), true );
            }

            $item->set_line_subtotal( $product->get_price_excluding_tax( $args['qty'] ) );
            $item->set_line_total( $product->get_price_excluding_tax( $args['qty'] ) );
        }

        if ( isset( $args['tax_class'] ) ) {
            $item->set_tax_class( $args['tax_class'] );
        }

        if ( isset( $args['product_id'] ) ) {
            $item->set_product_id( $args['product_id'] );
        }

        if ( isset( $args['variation_id'] ) ) {
            $item->set_variation_id( $args['variation_id'] );
        }

        if ( isset( $args['variation'] ) && is_array( $args['variation'] ) ) {
            foreach ( $args['variation'] as $key => $value ) {
                $item->add_meta_data( str_replace( 'attribute_', '', $key ), $value, true );
            }
        }

        if ( isset( $args['totals'] ) ) {
            // BW compatibility with old args
            if ( isset( $args['totals']['subtotal'] ) ) {
                $args['subtotal'] = $args['totals']['subtotal'];
            }
            if ( isset( $args['totals']['total'] ) ) {
                $args['total'] = $args['totals']['total'];
            }
            if ( isset( $args['totals']['subtotal_tax'] ) ) {
                $args['subtotal_tax'] = $args['totals']['subtotal_tax'];
            }
            if ( isset( $args['totals']['tax'] ) ) {
                $args['total_tax'] = $args['totals']['tax'];
            }
            if ( isset( $args['totals']['tax_data'] ) ) {
                $args['taxes'] = $args['totals']['tax_data'];
            }
        }

        if ( isset( $args['subtotal'] ) ) {
            $item->set_subtotal( $args['subtotal'] );
        }
        if ( isset( $args['total'] ) ) {
            $item->set_total( $args['total'] );
        }
        if ( isset( $args['subtotal_tax'] ) ) {
            $item->set_line_subtotal_tax( $args['subtotal_tax'] );
        }
        if ( isset( $args['total_tax'] ) ) {
            $item->set_total_tax( $args['total_tax'] );
        }
        if ( isset( $args['taxes'] ) ) {
            $item->set_taxes( $args['taxes'] );
        }

        $item->save();

        if ( ! $inserting ) {
            do_action( 'woocommerce_order_edit_product', $this->get_id(), $item->get_order_item_id(), $args, $product );
        }

        return $item->get_order_item_id();
    }

    /**
     * Add coupon code to the order.
     * Order must be saved prior to adding items.
     *
     * @param string $code
     * @param int $discount_amount
     * @param int $discount_amount_tax "Discounted" tax - used for tax inclusive prices.
     * @return int updated order item ID
     */
    public function add_coupon( $code, $discount_amount = 0, $discount_amount_tax = 0 ) {
        $args = wp_parse_args( $args, array(
            'code'                => $code,
            'discount_amount'     => $discount_amount,
            'discount_amount_tax' => $discount_amount_tax
        ) );
        $item = new WC_Order_Item_Coupon();
        $item_id = $this->update_coupon( $item, $args );

		do_action( 'woocommerce_order_add_coupon', $this->get_id(), $item->get_order_item_id(), $code, $discount_amount, $discount_amount_tax );

		return $item_id;
    }

    /**
     * Update coupon for order. Note this does not update order totals.
     * @since 2.2
     * @param object|int $item
     * @param array $args
     * @return int updated order item ID
     */
    public function update_coupon( $item, $args ) {
        if ( is_numeric( $item ) ) {
            $item = $this->get_item( $item );
        }

        if ( ! is_object( $product ) || ! $item->is_type( 'coupon' ) ) {
            return false;
        }

        if ( ! $this->get_id() ) {
            $this->save();
        }

		$item->set_order_id( $this->get_id() );

        if ( ! $item->get_order_item_id() ) {
            $inserting = true;
        } else {
            $inserting = false;
        }

        if ( isset( $args['code'] ) ) {
            $item->set_coupon_code( $args['code'] );
        }
        if ( isset( $args['discount_amount'] ) ) {
            $item->set_discount_amount( $args['discount_amount'] );
        }
        if ( isset( $args['discount_amount_tax'] ) ) {
            $item->set_discount_amount_tax( $args['discount_amount_tax'] );
        }

        $item->save();

        if ( ! $inserting ) {
            do_action( 'woocommerce_order_update_coupon', $this->get_id(), $item->get_order_item_id(), $args );
        }

        return $item->get_order_item_id();
    }

    /**
     * Add a shipping row to the order.
     * Order must be saved prior to adding items.
     *
     * @param WC_Shipping_Rate shipping_rate
     * @return int updated order item ID
     */
    public function add_shipping( $shipping_rate ) {
        $args = wp_parse_args( $args, array(
            'method_title' => $shipping_rate->label,
            'method_id'    => $shipping_rate->id,
            'cost'         => wc_format_decimal( $shipping_rate->cost ),
            'taxes'        => $shipping_rate->taxes,
            'meta'         => $shipping_rate->get_meta_data(),
        ) );

        $item = new WC_Order_Item_Shipping();
        $item_id = $this->update_shipping( $item, $args );

		do_action( 'woocommerce_order_add_shipping', $this->get_id(), $item->get_order_item_id(), $shipping_rate );

		return $item_id;
    }

    /**
     * Update shipping method for order.
     *
     * Note this does not update the order total.
     *
     * @since 2.2
     * @param object|int $item
     * @param array $args
     * @return int updated order item ID
     */
    public function update_shipping( $item, $args ) {
        if ( is_numeric( $item ) ) {
            $item = $this->get_item( $item );
        }

        if ( ! is_object( $product ) || ! $item->is_type( 'shipping' ) ) {
            return false;
        }

        if ( ! $this->get_id() ) {
            $this->save();
        }

		$item->set_order_id( $this->get_id() );

        if ( ! $item->get_order_item_id() ) {
            $inserting = true;
        } else {
            $inserting = false;
        }

        if ( isset( $args['method_title'] ) ) {
            $item->set_method_title( $args['method_title'] );
        }

        if ( isset( $args['method_id'] ) ) {
            $item->set_method_id( $args['method_id'] );
        }

        if ( isset( $args['cost'] ) ) {
            // Get old cost before updating
            $old_cost = $item->get_cost();

            // Update
            $item->set_cost( $args['cost'] );

            // Update total
            $this->set_total( $this->get_total_shipping() - wc_format_decimal( $old_cost ) + $item->get_cost(), 'shipping' );
        }

        if ( isset( $args['taxes'] ) && is_array( $args['taxes'] ) ) {
            $item->set_taxes( $args['taxes'] );
        }

        if ( isset( $args['meta'] ) && is_array( $args['meta'] ) ) {
			foreach ( $args['meta'] as $key => $value ) {
				$item->update_meta_data( $key, $value );
			}
		}

        $item->save();

        if ( ! $inserting ) {
            do_action( 'woocommerce_order_update_shipping', $this->get_id(), $item->get_order_item_id(), $args );
        }

        return $item->get_order_item_id();
    }

    /**
     * Add a fee to the order.
     * Order must be saved prior to adding items.
     * @param object $fee
     * @return int updated order item ID
     */
    public function add_fee( $fee ) {
        $args = wp_parse_args( $args, array(
            'name'      => $fee->name,
            'tax_class' => $fee->taxable ? $fee->tax_class : 0,
            'total'     => $fee->amount,
            'total_tax' => $fee->tax,
            'taxes'     => array(
                'total' => $fee->tax_data
            )
        ) );
        $item = new WC_Order_Item_Fee();
        $item_id = $this->update_fee( $item, $args );

        do_action( 'woocommerce_order_add_fee', $this->get_id(), $item->get_order_item_id(), $fee );

        return $item_id;
    }

    /**
     * Update fee for order.
     *
     * Note this does not update order totals.
     *
     * @since 2.2
     * @param object|int $item
     * @param array $args
     * @return int updated order item ID
     */
    public function update_fee( $item, $args ) {
        if ( is_numeric( $item ) ) {
            $item = $this->get_item( $item );
        }

        if ( ! is_object( $product ) || ! $item->is_type( 'fee' ) ) {
            return false;
        }

        if ( ! $this->get_id() ) {
            $this->save();
        }

		$item->set_order_id( $this->get_id() );

        if ( ! $item->get_order_item_id() ) {
            $inserting = true;
        } else {
            $inserting = false;
        }

        if ( isset( $args['name'] ) ) {
            $item->set_name( $args['name'] );
        }

        if ( isset( $args['tax_class'] ) ) {
            $item->set_tax_class( $args['tax_class'] );
        }

        if ( isset( $args['total'] ) ) {
            $item->set_total( $args['total'] );
        }

        if ( isset( $args['total_tax'] ) ) {
            $item->set_total_tax( $args['total_tax'] );
        }

        if ( isset( $args['taxes'] ) ) {
            $item->set_taxes( $args['taxes'] );
        }

        $item->save();

        if ( ! $inserting ) {
            do_action( 'woocommerce_order_update_fee', $this->get_id(), $item->get_order_item_id(), $args );
        }

        return $item->get_order_item_id();
    }

    /**
     * Add a tax row to the order.
     * Order must be saved prior to adding items.
     * @since 2.2
     * @param int tax_rate_id
     * @return int updated order item ID
     */
    public function add_tax( $tax_rate_id, $tax_amount = 0, $shipping_tax_amount = 0 ) {
        if ( ! $code = WC_Tax::get_rate_code( $tax_rate_id ) ) {
            return false;
        }

        $args = wp_parse_args( $args, array(
            'rate_code'          => $code,
            'rate_id'            => $tax_rate_id,
            'label'              => WC_Tax::get_rate_label( $tax_rate_id ),
            'compound'           => WC_Tax::is_compound( $tax_rate_id ),
            'tax_total'          => $tax_amount,
            'shipping_tax_total' => $shipping_tax_amount
        ) );
        $item = new WC_Order_Item_Tax();
        $item_id = $this->update_tax( $item, $args );

        do_action( 'woocommerce_order_add_tax', $this->get_id(), $item->get_order_item_id(), $tax_rate_id, $tax_amount, $shipping_tax_amount );

        return $item_id;
    }

    /**
     * Update tax line on order.
     * Note this does not update order totals.
     *
     * @since 2.6
     * @param object|int $item
     * @param array $args
     * @return int updated order item ID
     */
    public function update_tax( $item, $args ) {
        if ( is_numeric( $item ) ) {
            $item = $this->get_item( $item );
        }

        if ( ! is_object( $product ) || ! $item->is_type( 'tax' ) ) {
            return false;
        }

        if ( ! $this->get_id() ) {
            $this->save();
        }

		$item->set_order_id( $this->get_id() );

        if ( ! $item->get_order_item_id() ) {
            $inserting = true;
        } else {
            $inserting = false;
        }

        if ( isset( $args['rate_code'] ) ) {
            $item->set_rate_code( $args['rate_code'] );
        }

        if ( isset( $args['rate_id'] ) ) {
            $item->set_rate_id( $args['rate_id'] );
        }

        if ( isset( $args['label'] ) ) {
            $item->set_label( $args['label'] );
        }

        if ( isset( $args['compound'] ) ) {
            $item->set_compound( $args['compound'] );
        }

        if ( isset( $args['tax_total'] ) ) {
            $item->set_tax_total( $args['tax_total'] );
        }

        if ( isset( $args['shipping_tax_total'] ) ) {
            $item->set_shipping_tax_total( $args['shipping_tax_total'] );
        }

        $item->save();

        if ( ! $inserting ) {
            do_action( 'woocommerce_order_update_tax', $this->get_id(), $item->get_order_item_id(), $args );
        }

        return $item->get_order_item_id();
    }

	/**
     * Update tax lines at order level by looking at the line item taxes themselves.
     * @return bool success or fail.
     */
    public function update_taxes() {
        $cart_taxes     = array();
        $shipping_taxes = array();

        foreach ( $this->get_items( array( 'line_item', 'fee' ) ) as $item_id => $item ) {

This code seems to be duplicated across your project.

            $taxes = $item->get_taxes();
            if ( isset( $taxes['total'] ) ) {
                foreach ( $taxes['total'] as $tax_rate_id => $tax ) {
                    if ( ! isset( $cart_taxes[ $tax_rate_id ] ) ) {
                        $cart_taxes[ $tax_rate_id ] = 0;
                    }
                    $cart_taxes[ $tax_rate_id ] += $tax;
                }
            }
        }

        foreach ( $this->get_items( array( 'shipping' ) ) as $item_id => $item ) {

This code seems to be duplicated across your project.

			$taxes = $item->get_taxes();
            if ( isset( $taxes['total'] ) ) {
                foreach ( $taxes['total'] as $tax_rate_id => $tax ) {
                    if ( ! isset( $shipping_taxes[ $tax_rate_id ] ) ) {
                        $shipping_taxes[ $tax_rate_id ] = 0;
                    }
                    $shipping_taxes[ $tax_rate_id ] += $tax;
                }
            }
        }

        // Remove old existing tax rows.
        $this->remove_order_items( 'tax' );

        // Now merge to keep tax rows.
        foreach ( array_keys( $cart_taxes + $shipping_taxes ) as $tax_rate_id ) {

This code seems to be duplicated across your project.

            $this->add_tax( $tax_rate_id, isset( $cart_taxes[ $tax_rate_id ] ) ? $cart_taxes[ $tax_rate_id ] : 0, isset( $shipping_taxes[ $tax_rate_id ] ) ? $shipping_taxes[ $tax_rate_id ] : 0 );
        }

        // Save tax totals
        $this->set_total( WC_Tax::round( array_sum( $shipping_taxes ) ), 'shipping_tax' );
        $this->set_total( WC_Tax::round( array_sum( $cart_taxes ) ), 'tax' );

        return true;
    }

    /*
    |--------------------------------------------------------------------------
    | Calculations.
    |--------------------------------------------------------------------------
    |
    | These methods calculate order totals and taxes based on the current data.
    |
    */

    /**
     * Calculate shipping total.
     *
     * @since 2.2
     * @return float
     */
    public function calculate_shipping() {
        $shipping_total = 0;

        foreach ( $this->get_shipping_methods() as $shipping ) {
            $shipping_total += $shipping->get_total();
        }

        $this->set_total( $shipping_total, 'shipping' );

        return $this->get_shipping_total();
    }

    /**
     * Calculate taxes for all line items and shipping, and store the totals and tax rows.
     *
     * Will use the base country unless customer addresses are set.
     *
     * @return bool success or fail.
     */
    public function calculate_taxes() {
        $cart_tax     = 0;
        $cart_taxes   = array();
        $tax_based_on = get_option( 'woocommerce_tax_based_on' );

        if ( 'billing' === $tax_based_on ) {
            $country  = $this->get_billing_country();
            $state    = $this->get_billing_state();
            $postcode = $this->get_billing_postcode();
            $city     = $this->get_billing_city();
        } elseif ( 'shipping' === $tax_based_on ) {
            $country  = $this->get_shipping_country();
            $state    = $this->get_shipping_state();
            $postcode = $this->get_shipping_postcode();
            $city     = $this->get_shipping_city();
        }

        // Default to base
        if ( 'base' === $tax_based_on || empty( $country ) ) {

This code seems to be duplicated across your project.

            $default  = wc_get_base_location();
            $country  = $default['country'];
            $state    = $default['state'];
            $postcode = '';
            $city     = '';
        }

        // Get items
        foreach ( $this->get_items( array( 'line_item', 'fee' ) ) as $item_id => $item ) {
			$tax_class  = $item->get_tax_class();
			$tax_status = $item->get_tax_status();

$tax_status is not used, you could remove the assignment.

            if ( '0' !== $tax_class && 'taxable' === $item_tax_status ) {

                $tax_rates = WC_Tax::find_rates( array(
                    'country'   => $country,
                    'state'     => $state,
                    'postcode'  => $postcode,
                    'city'      => $city,
                    'tax_class' => $tax_class
                ) );

				$total     = $item->get_total();
				$taxes     = WC_Tax::calc_tax( $total, $tax_rates, false );
				$total_tax = max( 0, array_sum( $taxes ) );
				$cart_tax += $total_tax;
				$item->set_total_tax( $total_tax );

				if ( $item->is_type( 'line_item' ) ) {
					$subtotal       = $item->get_subtotal();
					$subtotal_taxes = WC_Tax::calc_tax( $subtotal, $tax_rates, false );
					$subtotal_tax   = max( 0, array_sum( $subtotal_taxes ) );
					$item->set_subtotal_tax( $subtotal_tax );
					$item->set_taxes( array( 'total' => $taxes, 'subtotal' => $subtotal_taxes ) );
				} else {
					$item->set_taxes( array( 'total' => $taxes ) );
				}

				$item->save(); //@todo store items to self, don't save right away

                // Sum the item taxes
                foreach ( array_keys( $cart_taxes + $taxes ) as $key ) {

This code seems to be duplicated across your project.

                    $cart_taxes[ $key ] = ( isset( $taxes[ $key ] ) ? $taxes[ $key ] : 0 ) + ( isset( $taxes[ $key ] ) ? $cart_taxes[ $key ] : 0 );
                }
            }
        }

        // Now calculate shipping tax
        $shipping_methods = $this->get_shipping_methods();

        if ( ! empty( $shipping_methods ) ) {
            $matched_tax_rates = array();
            $tax_rates         = WC_Tax::find_rates( array(
                'country'   => $country,
                'state'     => $state,
                'postcode'  => $postcode,
                'city'      => $city,
                'tax_class' => ''
            ) );

            if ( ! empty( $tax_rates ) ) {

This code seems to be duplicated across your project.

                foreach ( $tax_rates as $key => $rate ) {
                    if ( isset( $rate['shipping'] ) && 'yes' === $rate['shipping'] ) {
                        $matched_tax_rates[ $key ] = $rate;
                    }
                }
            }

            $shipping_taxes     = WC_Tax::calc_shipping_tax( $this->order_shipping, $matched_tax_rates );
            $shipping_tax_total = WC_Tax::round( array_sum( $shipping_taxes ) );
        } else {
            $shipping_taxes     = array();
            $shipping_tax_total = 0;
        }

        // Save tax totals
        $this->set_total( $shipping_tax_total, 'shipping_tax' );
        $this->set_total( $tax_total, 'tax' );

        // Tax rows
        $this->remove_order_items( 'tax' );

        // Now merge to keep tax rows
        foreach ( array_keys( $taxes + $shipping_taxes ) as $tax_rate_id ) {

This code seems to be duplicated across your project.

            $this->add_tax( $tax_rate_id, isset( $taxes[ $tax_rate_id ] ) ? $taxes[ $tax_rate_id ] : 0, isset( $shipping_taxes[ $tax_rate_id ] ) ? $shipping_taxes[ $tax_rate_id ] : 0 );
        }

        return true;
    }

    /**
     * Calculate totals by looking at the contents of the order. Stores the totals and returns the orders final total.
     *
     * @since 2.2
     * @param  bool $and_taxes Calc taxes if true.
     * @return float calculated grand total.
     */
    public function calculate_totals( $and_taxes = true ) {
        $cart_subtotal     = 0;
        $cart_total        = 0;
        $fee_total         = 0;
        $cart_subtotal_tax = 0;
        $cart_total_tax    = 0;

        if ( $and_taxes && wc_tax_enabled() ) {
            $this->calculate_taxes();
        }

        // line items
        foreach ( $this->get_items() as $item ) {
            $cart_subtotal     += wc_format_decimal( isset( $item['line_subtotal'] ) ? $item['line_subtotal'] : 0 );
            $cart_total        += wc_format_decimal( isset( $item['line_total'] ) ? $item['line_total'] : 0 );
            $cart_subtotal_tax += wc_format_decimal( isset( $item['line_subtotal_tax'] ) ? $item['line_subtotal_tax'] : 0 );
            $cart_total_tax    += wc_format_decimal( isset( $item['line_tax'] ) ? $item['line_tax'] : 0 );
        }

        $this->calculate_shipping();

        foreach ( $this->get_fees() as $item ) {
            $fee_total += $item['line_total'];
        }

        $this->set_total( $cart_subtotal - $cart_total, 'cart_discount' );
        $this->set_total( $cart_subtotal_tax - $cart_total_tax, 'cart_discount_tax' );

        $grand_total = round( $cart_total + $fee_total + $this->get_total_shipping() + $this->get_cart_tax() + $this->get_shipping_tax(), wc_get_price_decimals() );

        $this->set_total( $grand_total, 'total' );

        return $grand_total;
    }

    /*
    |--------------------------------------------------------------------------
    | Total Getters
    |--------------------------------------------------------------------------
    |
    | Methods for getting totals e.g. for display on the frontend.
    |
    */

    /**
     * Get a product (either product or variation).
     *
     * @param object $item
     * @return WC_Product|bool
     */
    public function get_product_from_item( $item ) {
        if ( is_callable( array( $item, 'get_product' ) ) ) {
            $product = $item->get_product();
        } else {
            $product = false;
        }
        return apply_filters( 'woocommerce_get_product_from_item', $product, $item, $this );
    }

    /**
     * Get item subtotal - this is the cost before discount.
     *
     * @param object $item
     * @param bool $inc_tax (default: false).
     * @param bool $round (default: true).
     * @return float
     */
    public function get_item_subtotal( $item, $inc_tax = false, $round = true ) {

This method seems to be duplicated in your project.

        $subtotal = 0;

        if ( is_callable( array( $item, 'get_subtotal' ) ) ) {
            if ( $inc_tax ) {
                $subtotal = ( $item->get_subtotal() + $item->get_subtotal_tax() ) / max( 1, $item->get_qty() );
            } else {
                $subtotal = ( $item->get_subtotal() / max( 1, $item->get_qty() ) );
            }

            $subtotal = $round ? number_format( (float) $subtotal, wc_get_price_decimals(), '.', '' ) : $subtotal;
        }

        return apply_filters( 'woocommerce_order_amount_item_subtotal', $subtotal, $this, $item, $inc_tax, $round );
    }

    /**
     * Get line subtotal - this is the cost before discount.
     *
     * @param object $item
     * @param bool $inc_tax (default: false).
     * @param bool $round (default: true).
     * @return float
     */
    public function get_line_subtotal( $item, $inc_tax = false, $round = true ) {

This method seems to be duplicated in your project.

        $subtotal = 0;

        if ( is_callable( array( $item, 'get_subtotal' ) ) ) {
            if ( $inc_tax ) {
                $subtotal = $item->get_subtotal() + $item->get_subtotal_tax();
            } else {
                $subtotal = $item->get_subtotal();
            }

            $subtotal = $round ? round( $subtotal, wc_get_price_decimals() ) : $subtotal;
        }

        return apply_filters( 'woocommerce_order_amount_line_subtotal', $subtotal, $this, $item, $inc_tax, $round );
    }

    /**
     * Calculate item cost - useful for gateways.
     *
     * @param object $item
     * @param bool $inc_tax (default: false).
     * @param bool $round (default: true).
     * @return float
     */
    public function get_item_total( $item, $inc_tax = false, $round = true ) {

This method seems to be duplicated in your project.

        $total = 0;

        if ( is_callable( array( $item, 'get_total' ) ) ) {
            if ( $inc_tax ) {
                $total = ( $item->get_total() + $item->get_total_tax() ) / max( 1, $item->get_qty() );
            } else {
                $total = $item->get_total() / max( 1, $item->get_qty() );
            }

            $total = $round ? round( $total, wc_get_price_decimals() ) : $total;
        }

        return apply_filters( 'woocommerce_order_amount_item_total', $total, $this, $item, $inc_tax, $round );
    }

    /**
     * Calculate line total - useful for gateways.
     *
     * @param object $item
     * @param bool $inc_tax (default: false).
     * @param bool $round (default: true).
     * @return float
     */
    public function get_line_total( $item, $inc_tax = false, $round = true ) {

This method seems to be duplicated in your project.

        $total = 0;

        if ( is_callable( array( $item, 'get_total' ) ) ) {
            // Check if we need to add line tax to the line total.
            $total = $inc_tax ? $item->get_total() + $item->get_total_tax() : $item->get_total();

            // Check if we need to round.
            $total = $round ? round( $total, wc_get_price_decimals() ) : $total;
        }

        return apply_filters( 'woocommerce_order_amount_line_total', $total, $this, $item, $inc_tax, $round );
    }

    /**
     * Get item tax - useful for gateways.
     *
     * @param mixed $item
     * @param bool $round (default: true).
     * @return float
     */
    public function get_item_tax( $item, $round = true ) {
        $tax = 0;

        if ( is_callable( array( $item, 'get_total_tax' ) ) ) {
            $tax = $item->get_total_tax() / max( 1, $item->get_qty() );
            $tax = $round ? wc_round_tax_total( $tax ) : $tax;
        }

        return apply_filters( 'woocommerce_order_amount_item_tax', $tax, $item, $round, $this );
    }

    /**
     * Get line tax - useful for gateways.
     *
     * @param mixed $item
     * @return float
     */
    public function get_line_tax( $item ) {
        return apply_filters( 'woocommerce_order_amount_line_tax', is_callable( array( $item, 'get_total_tax' ) ) ? wc_round_tax_total( $item->get_total_tax() ) : 0, $item, $this );
    }

    /**
     * Gets line subtotal - formatted for display.
     *
     * @param array  $item
     * @param string $tax_display
     * @return string
     */
    public function get_formatted_line_subtotal( $item, $tax_display = '' ) {
        $tax_display = $tax_display ? $tax_display : get_option( 'woocommerce_tax_display_cart' );

        if ( ! isset( $item['line_subtotal'] ) || ! isset( $item['line_subtotal_tax'] ) ) {
            return '';
        }

        if ( 'excl' == $tax_display ) {
            $ex_tax_label = $this->get_prices_include_tax() ? 1 : 0;

            $subtotal = wc_price( $this->get_line_subtotal( $item ), array( 'ex_tax_label' => $ex_tax_label, 'currency' => $this->get_order_currency() ) );

$item is of type array<string,?,{"line_subtotal":"?","line_subtotal_tax":"?"}>, but the function expects a object.

        } else {
            $subtotal = wc_price( $this->get_line_subtotal( $item, true ), array('currency' => $this->get_order_currency()) );

$item is of type array<string,?,{"line_subtotal":"?","line_subtotal_tax":"?"}>, but the function expects a object.

        }

        return apply_filters( 'woocommerce_order_formatted_line_subtotal', $subtotal, $item, $this );
    }

    /**
     * Gets order total - formatted for display.
     *
     * @return string
     */
    public function get_formatted_order_total() {
        $formatted_total = wc_price( $this->get_total(), array( 'currency' => $this->get_order_currency() ) );
        return apply_filters( 'woocommerce_get_formatted_order_total', $formatted_total, $this );
    }

    /**
     * Gets subtotal - subtotal is shown before discounts, but with localised taxes.
     *
     * @param bool $compound (default: false).
     * @param string $tax_display (default: the tax_display_cart value).
     * @return string
     */
    public function get_subtotal_to_display( $compound = false, $tax_display = '' ) {
        $tax_display = $tax_display ? $tax_display : get_option( 'woocommerce_tax_display_cart' );
        $subtotal    = 0;

        if ( ! $compound ) {
            foreach ( $this->get_items() as $item ) {
                $subtotal += $item->get_subtotal();

                if ( 'incl' === $tax_display ) {
                    $subtotal += $item->get_subtotal_tax();
                }
            }

            $subtotal = wc_price( $subtotal, array( 'currency' => $this->get_order_currency() ) );

            if ( 'excl' === $tax_display && $this->get_prices_include_tax() ) {
                $subtotal .= ' <small class="tax_label">' . WC()->countries->ex_tax_or_vat() . '</small>';
            }

        } else {
            if ( 'incl' === $tax_display ) {
                return '';
            }

            foreach ( $this->get_items() as $item ) {
                $subtotal += $item->get_subtotal();
            }

            // Add Shipping Costs.
            $subtotal += $this->get_total_shipping();

            // Remove non-compound taxes.
            foreach ( $this->get_taxes() as $tax ) {
                if ( ! empty( $tax['compound'] ) ) {
                    continue;
                }
                $subtotal = $subtotal + $tax['tax_amount'] + $tax['shipping_tax_amount'];
            }

            // Remove discounts.
            $subtotal = $subtotal - $this->get_total_discount();
            $subtotal = wc_price( $subtotal, array( 'currency' => $this->get_order_currency() ) );
        }

        return apply_filters( 'woocommerce_order_subtotal_to_display', $subtotal, $compound, $this );
    }

    /**
     * Gets shipping (formatted).
     *
     * @return string
     */
    public function get_shipping_to_display( $tax_display = '' ) {
        $tax_display = $tax_display ? $tax_display : get_option( 'woocommerce_tax_display_cart' );

        if ( $this->order_shipping != 0 ) {

            if ( $tax_display == 'excl' ) {

                // Show shipping excluding tax.
                $shipping = wc_price( $this->order_shipping, array('currency' => $this->get_order_currency()) );

                if ( $this->order_shipping_tax != 0 && $this->prices_include_tax ) {

This code seems to be duplicated across your project.

                    $shipping .= apply_filters( 'woocommerce_order_shipping_to_display_tax_label', '&nbsp;<small class="tax_label">' . WC()->countries->ex_tax_or_vat() . '</small>', $this, $tax_display );
                }

            } else {

                // Show shipping including tax.
                $shipping = wc_price( $this->order_shipping + $this->order_shipping_tax, array('currency' => $this->get_order_currency()) );

                if ( $this->order_shipping_tax != 0 && ! $this->prices_include_tax ) {

This code seems to be duplicated across your project.

                    $shipping .= apply_filters( 'woocommerce_order_shipping_to_display_tax_label', '&nbsp;<small class="tax_label">' . WC()->countries->inc_tax_or_vat() . '</small>', $this, $tax_display );
                }

            }

            $shipping .= apply_filters( 'woocommerce_order_shipping_to_display_shipped_via', '&nbsp;<small class="shipped_via">' . sprintf( __( 'via %s', 'woocommerce' ), $this->get_shipping_method() ) . '</small>', $this );

        } elseif ( $this->get_shipping_method() ) {
            $shipping = $this->get_shipping_method();
        } else {
            $shipping = __( 'Free!', 'woocommerce' );
        }

        return apply_filters( 'woocommerce_order_shipping_to_display', $shipping, $this );
    }

    /**
     * Get the discount amount (formatted).
     * @since  2.3.0
     * @return string
     */
    public function get_discount_to_display( $tax_display = '' ) {
        $tax_display = $tax_display ? $tax_display : get_option( 'woocommerce_tax_display_cart' );
        return apply_filters( 'woocommerce_order_discount_to_display', wc_price( $this->get_total_discount( 'excl' === $tax_display && 'excl' === get_option( 'woocommerce_tax_display_cart' ) ), array( 'currency' => $this->get_order_currency() ) ), $this );
    }

    /**
     * Get totals for display on pages and in emails.
     *
     * @param mixed $tax_display
     * @return array
     */
    public function get_order_item_totals( $tax_display = '' ) {
        $tax_display = $tax_display ? $tax_display : get_option( 'woocommerce_tax_display_cart' );
        $total_rows  = array();

        if ( $subtotal = $this->get_subtotal_to_display( false, $tax_display ) ) {
            $total_rows['cart_subtotal'] = array(
                'label' => __( 'Subtotal:', 'woocommerce' ),
                'value'    => $subtotal
            );
        }

        if ( $this->get_total_discount() > 0 ) {
            $total_rows['discount'] = array(
                'label' => __( 'Discount:', 'woocommerce' ),
                'value'    => '-' . $this->get_discount_to_display( $tax_display )
            );
        }

        if ( $this->get_shipping_method() ) {
            $total_rows['shipping'] = array(
                'label' => __( 'Shipping:', 'woocommerce' ),
                'value'    => $this->get_shipping_to_display( $tax_display )
            );
        }

        if ( $fees = $this->get_fees() ) {
            foreach ( $fees as $id => $fee ) {
                if ( apply_filters( 'woocommerce_get_order_item_totals_excl_free_fees', empty( $fee['line_total'] ) && empty( $fee['line_tax'] ), $id ) ) {
                    continue;
                }
                $total_rows[ 'fee_' . $fee->get_order_item_id() ] = array(
                    'label' => $fee->get_name() . ':',
                    'value' => wc_price( 'excl' === $tax_display ? $fee->get_total() : $fee->get_total() + $fee->get_total_tax(), array('currency' => $this->get_order_currency()) )
                );
            }
        }

        // Tax for tax exclusive prices.
        if ( 'excl' === $tax_display ) {

            if ( get_option( 'woocommerce_tax_total_display' ) == 'itemized' ) {

                foreach ( $this->get_tax_totals() as $code => $tax ) {

                    $total_rows[ sanitize_title( $code ) ] = array(
                        'label' => $tax->label . ':',
                        'value'    => $tax->formatted_amount
                    );
                }

            } else {

                $total_rows['tax'] = array(
                    'label' => WC()->countries->tax_or_vat() . ':',
                    'value'    => wc_price( $this->get_total_tax(), array( 'currency' => $this->get_order_currency() ) )
                );
            }
        }

        if ( $this->get_total() > 0 && $this->get_payment_method_title() ) {
            $total_rows['payment_method'] = array(
                'label' => __( 'Payment Method:', 'woocommerce' ),
                'value' => $this->get_payment_method_title()
            );
        }

        if ( $refunds = $this->get_refunds() ) {

It seems like you code against a specific sub-type and not the parent class WC_Abstract_Order as the method get_refunds() does only exist in the following sub-classes of WC_Abstract_Order: WC_Order. Maybe you want to instanceof check for one of these explicitly?

            foreach ( $refunds as $id => $refund ) {
                $total_rows[ 'refund_' . $id ] = array(
                    'label' => $refund->get_refund_reason() ? $refund->get_refund_reason() : __( 'Refund', 'woocommerce' ) . ':',
                    'value'    => wc_price( '-' . $refund->get_refund_amount(), array( 'currency' => $this->get_order_currency() ) )
                );
            }
        }

        $total_rows['order_total'] = array(
            'label' => __( 'Total:', 'woocommerce' ),
            'value'    => $this->get_formatted_order_total( $tax_display )

The call to WC_Abstract_Order::get_formatted_order_total() has too many arguments starting with $tax_display.

        );

        return apply_filters( 'woocommerce_get_order_item_totals', $total_rows, $this );
    }

    /*
    |--------------------------------------------------------------------------
    | Conditionals
    |--------------------------------------------------------------------------
    |
    | Checks if a condition is true or false.
    |
    */

    /**
     * Checks the order status against a passed in status.
     *
     * @return bool
     */
    public function has_status( $status ) {
        return apply_filters( 'woocommerce_order_has_status', ( is_array( $status ) && in_array( $this->get_status(), $status ) ) || $this->get_status() === $status ? true : false, $this, $status );
    }

    /**
     * has_meta function for order items.
     *
     * @param string $order_item_id
     * @return array of meta data.
     */
    public function has_meta( $order_item_id ) {
        global $wpdb;

        return $wpdb->get_results( $wpdb->prepare( "SELECT meta_key, meta_value, meta_id, order_item_id
            FROM {$wpdb->prefix}woocommerce_order_itemmeta WHERE order_item_id = %d
            ORDER BY meta_id", absint( $order_item_id ) ), ARRAY_A );
    }

    /**
     * Check whether this order has a specific shipping method or not.
     *
     * @param string $method_id
     * @return bool
     */
    public function has_shipping_method( $method_id ) {
        foreach ( $this->get_shipping_methods() as $shipping_method ) {
            if ( $shipping_method->get_method_id() === $method_id ) {
                return true;
            }
        }
        return false;
    }

    /**
     * Check if an order key is valid.
     *
     * @param mixed $key
     * @return bool
     */
    public function key_is_valid( $key ) {
        return $key === $this->get_order_key();
    }

    /**
     * Returns true if the order contains a free product.
     * @since 2.5.0
     * @return bool
     */
    public function has_free_item() {
        foreach ( $this->get_items() as $item ) {
            if ( ! $item->get_total() ) {
                return true;
            }
        }
        return false;
    }
}