woocommerce-paypal-payments/modules/ppcp-wc-gateway/src/Gateway/class-processpaymenttrait.php

<?php
/**
 * The process_payment functionality for the both gateways.
 *
 * @package WooCommerce\PayPalCommerce\WcGateway\Gateway
 */

declare( strict_types=1 );

namespace WooCommerce\PayPalCommerce\WcGateway\Gateway;

use WooCommerce\PayPalCommerce\ApiClient\Entity\OrderStatus;
use WooCommerce\PayPalCommerce\ApiClient\Exception\PayPalApiException;
use WooCommerce\PayPalCommerce\ApiClient\Exception\RuntimeException;

/**
 * Trait ProcessPaymentTrait
 */
trait ProcessPaymentTrait {
	/**
	 * Process a payment for an WooCommerce order.
	 *
	 * @param int $order_id The WooCommerce order id.
	 *
	 * @return array|null
	 */
	public function process_payment( $order_id ) {
		global $woocommerce;
		$wc_order = wc_get_order( $order_id );
		if ( ! is_a( $wc_order, \WC_Order::class ) ) {
			return null;
		}

        /**
         * If customer has chosed a saved credit card payment.
         */
        $saved_credit_card = filter_input(INPUT_POST, 'saved_credit_card', FILTER_SANITIZE_STRING);
		if($saved_credit_card) {

            $user_id  = (int) $wc_order->get_customer_id();
            $customer = new \WC_Customer( $user_id );
            $tokens = $this->payment_token_repository->all_for_user_id( (int) $customer->get_id() );

            $selected_token = null;
            foreach ($tokens as $token) {
                if($token->id() === $saved_credit_card) {
                    $selected_token = $token;
                    break;
                }
            }

            if(!$selected_token) {
                return null;
            }

            $purchase_unit = $this->purchase_unit_factory->from_wc_order( $wc_order );
            $payer         = $this->payer_factory->from_customer( $customer );
            try {
                $order = $this->order_endpoint->create(
                    array( $purchase_unit ),
                    $payer,
                    $selected_token
                );

                if ( $order->status()->is( OrderStatus::COMPLETED ) && $order->intent() === 'CAPTURE' ) {
                    $wc_order->update_status(
                        'processing',
                        __( 'Payment received.', 'woocommerce-paypal-payments' )
                    );

                    $this->session_handler->destroy_session_data();
                    return array(
                        'result'   => 'success',
                        'redirect' => $this->get_return_url( $wc_order ),
                    );
                }
            } catch (RuntimeException $error) {
                $this->session_handler->destroy_session_data();
                wc_add_notice( $error->getMessage(), 'error' );
                return null;
            }
        }

		/**
		 * If the WC_Order is payed through the approved webhook.
		 */
		//phpcs:disable WordPress.Security.NonceVerification.Recommended
		if ( isset( $_REQUEST['ppcp-resume-order'] ) && $wc_order->has_status( 'processing' ) ) {
			$this->session_handler->destroy_session_data();
			return array(
				'result'   => 'success',
				'redirect' => $this->get_return_url( $wc_order ),
			);
		}
		//phpcs:enable WordPress.Security.NonceVerification.Recommended

		try {
			if ( $this->order_processor->process( $wc_order, $woocommerce ) ) {
				$this->session_handler->destroy_session_data();
				return array(
					'result'   => 'success',
					'redirect' => $this->get_return_url( $wc_order ),
				);
			}
		} catch ( PayPalApiException $error ) {
			if ( $error->has_detail( 'INSTRUMENT_DECLINED' ) ) {
				$this->session_handler->increment_insufficient_funding_tries();
				$host = $this->config->has( 'sandbox_on' ) && $this->config->get( 'sandbox_on' ) ?
					'https://www.sandbox.paypal.com/' : 'https://www.paypal.com/';
				$url  = $host . 'checkoutnow?token=' . $this->session_handler->order()->id();
				if ( $this->session_handler->insufficient_funding_tries() >= 3 ) {
					$this->session_handler->destroy_session_data();
					wc_add_notice(
						__( 'Please use a different payment method.', 'woocommerce-paypal-payments' ),
						'error'
					);
					return null;
				}
				return array(
					'result'   => 'success',
					'redirect' => $url,
				);
			}

			$this->session_handler->destroy_session_data();
		} catch ( RuntimeException $error ) {
			$this->session_handler->destroy_session_data();
			wc_add_notice( $error->getMessage(), 'error' );
			return null;
		}

		wc_add_notice(
			$this->order_processor->last_error(),
			'error'
		);

		return null;
	}

	/**
	 * Checks if vault enabled setting for PayPal or credit card is enabled.
	 *
	 * @return bool Whether vault settings are enabled or not.
	 * @throws \WooCommerce\PayPalCommerce\WcGateway\Exception\NotFoundException When a setting hasn't been found.
	 */
	protected function vault_settings_enabled(): bool {
		if ( $this->config->has( 'vault_enabled' ) && $this->config->get( 'vault_enabled' ) ) {
			return true;
		}
		if ( $this->config->has( 'dcc_vault_enabled' ) && $this->config->get( 'dcc_vault_enabled' ) ) {
			return true;
		}
		return false;
	}
}