AyeCode / invoicing

        return apply_filters( 'wpinv_cart_details', $this->cart_details, $this->ID, $this );

    }

    public function get_subtotal( $currency = false ) {

        $subtotal = wpinv_round_amount( $this->subtotal );

        if ( $currency ) {

            $subtotal = wpinv_price( wpinv_format_amount( $subtotal, NULL, !$currency ), $this->get_currency() );

        }

        return apply_filters( 'wpinv_get_invoice_subtotal', $subtotal, $this->ID, $this, $currency );

    }

    public function get_total( $currency = false ) {        

        if ( $this->is_free_trial() ) {

        return apply_filters( 'wpinv_get_invoice_subtotal', $subtotal, $this->ID, $this, $currency );

    }

    public function get_total( $currency = false ) {        

        if ( $this->is_free_trial() ) {

            $total = wpinv_round_amount( 0 );

        } else {

            $total = wpinv_round_amount( $this->total );

        }

        if ( $currency ) {

            $total = wpinv_price( wpinv_format_amount( $total, NULL, !$currency ), $this->get_currency() );

        }

        return apply_filters( 'wpinv_get_invoice_total', $total, $this->ID, $this, $currency );

    }

    public function get_recurring_details( $field = '', $currency = false ) {        

        $data                 = array();

        return $this->discount_code;

    }

    public function get_tax( $currency = false ) {

        $tax = wpinv_round_amount( $this->tax );

        if ( $currency ) {

            $tax = wpinv_price( wpinv_format_amount( $tax, NULL, !$currency ), $this->get_currency() );

        }

        return apply_filters( 'wpinv_get_invoice_tax', $tax, $this->ID, $this, $currency );

    }

    public function get_fees( $type = 'all' ) {

        $fees    = array();