WP GlobalCart - klarna-checkout-for-woocommerce

    public function process_cart() {
        foreach ( WC()->cart->get_cart() as $cart_item ) {
            do_action( 'woocommerce/cart_loop/start', $cart_item );
            if ( $cart_item['quantity'] ) {
                if ( $cart_item['variation_id'] ) {
                    $product = wc_get_product( $cart_item['variation_id'] );
                } else {
                    $product = wc_get_product( $cart_item['product_id'] );
                }
                $this->total_amount        = self::format_number( $cart_item['line_total'] );
                $this->subtotal_amount     = self::format_number( $cart_item['line_subtotal'] );
                $this->total_tax_amount    = self::format_number( array_sum( $cart_item['line_tax_data']['total'] ) );
                $this->subtotal_tax_amount = self::format_number( array_sum( $cart_item['line_tax_data']['subtotal'] ) );
                $this->quantity            = $cart_item['quantity'];

                $klarna_item = array(
                    'reference'             => $this->get_item_reference( $product ),
                    'name'                  => $this->get_item_name( $cart_item ),
                    'quantity'              => $this->get_item_quantity( $cart_item ),
                    'unit_price'            => $this->get_item_price( $cart_item ),
                    'tax_rate'              => $this->get_item_tax_rate( $cart_item, $product ),
                    'total_amount'          => $this->get_item_total_amount( $cart_item, $product ),
                    'total_tax_amount'      => $this->get_item_tax_amount( $cart_item, $product ),
                    'total_discount_amount' => $this->get_item_discount_amount( $cart_item, $product ),
                );

                if ( class_exists( 'WC_Subscriptions_Product' ) && WC_Subscriptions_Product::is_subscription( $product ) ) {
                    $klarna_item['subscription'] = array(
                        'name'           => $klarna_item['name'],
                        'interval'       => strtoupper( WC_Subscriptions_Product::get_period( $product ) ),
                        'interval_count' => absint( WC_Subscriptions_Product::get_interval( $product ) ),
                    );
                }

                // Product type.
                if ( $product->is_downloadable() || $product->is_virtual() ) {
                    $klarna_item['type'] = 'digital';
                } else {
                    $klarna_item['type'] = 'physical';
                }

                // Add images.
                $klarna_checkout_settings = get_option( 'woocommerce_kco_settings', array() );
                if ( isset( $klarna_checkout_settings ) && 'yes' === $klarna_checkout_settings['send_product_urls'] ) {
                    $klarna_item['product_url'] = $this->get_item_product_url( $product );
                    if ( $this->get_item_image_url( $product ) ) {
                        $klarna_item['image_url'] = $this->get_item_image_url( $product );
                    }
                }

                /* This should better support get_catalog_visibility = hidden on product components.  */
                $cart_line_item = apply_filters( 'kco_wc_cart_line_item', $klarna_item, $cart_item );
                if ( $cart_line_item ) {
                    $this->order_lines[] = $cart_line_item;
                }
            }
            do_action( 'woocommerce/cart_loop/end', $cart_item );
        }
    }