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Edit File: class-cartflows-global-checkout.php

<?php
/**
 * Global Checkout.
 *
 * @package CartFlows
 */

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}
/**
 * Global Checkout
 *
 * @since 1.0.0
 */
class Cartflows_Global_Checkout {

/**
	 * Member Variable
	 *
	 * @var object instance
	 */
	private static $instance;

/**
	 *  Initiator
	 */
	public static function get_instance() {
		if ( ! isset( self::$instance ) ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

/**
	 *  Constructor
	 */
	public function __construct() {

/* Global Checkout */
		add_action( 'wp', array( $this, 'override_global_checkout' ), 0 );
		add_action( 'wp', array( $this, 'maybe_override_order_pay_page' ), 0 );
		add_action( 'template_redirect', array( $this, 'global_checkout_template_redirect' ), 1 );
		add_action( 'admin_bar_menu', array( $this, 'update_checkout_link_for_global_checkout' ), 999 );
	}

/**
	 * Update the checkout page link for global checkout.
	 *
	 * @since 1.10.0
	 */
	public function update_checkout_link_for_global_checkout() {

if ( _is_wcf_checkout_type() ) {

global $wp_admin_bar;
			global $post;

$common                   = Cartflows_Helper::get_common_settings();
			$global_checkout          = intval( $common['global_checkout'] );
			$override_global_checkout = $common['override_global_checkout'];

if ( $post && $global_checkout === $post->ID && 'enable' === $override_global_checkout ) {

$edit_node = $wp_admin_bar->get_node( 'edit' );

if ( $edit_node ) {
					$edit_node->href = wcf()->flow->get_prepared_edit_step_url( $post->ID );
					$wp_admin_bar->add_node( $edit_node );
				}
			}
		}
	}

/**
	 * Override global checkout page
	 *
	 * @since 1.10.0
	 */
	public function override_global_checkout() {

if ( wcf()->utils->is_step_post_type() ) {
			return;
		}

if ( is_product() || ! is_checkout() || is_order_received_page() || is_checkout_pay_page() ) {
			return;
		}

// Return if the key OR Order parameter is found in the URL for certain Payment gateways.
		if ( $this->should_show_global_checkout() ) { //phpcs:ignore WordPress.Security.NonceVerification.Recommended
			return;
		}

$common = Cartflows_Helper::get_common_settings();

$global_checkout          = $common['global_checkout'];
		$override_global_checkout = $common['override_global_checkout'];

// Override only WooCommerce checkout page with CartFlows checkout page.
		if ( ! empty( $global_checkout ) && 'enable' === $override_global_checkout ) {

$checkout_post = get_post( $global_checkout );

if ( $checkout_post && 'publish' === $checkout_post->post_status ) {

if ( isset( $GLOBALS['posts'][0] ) ) {
					$GLOBALS['posts'][0] = $checkout_post; //phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
				}

if ( isset( $GLOBALS['wp_the_query']->post ) ) {
					$GLOBALS['wp_the_query']->post = $checkout_post; //phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
				}

$GLOBALS['post'] = $checkout_post; //phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
			}
		}
	}

/**
	 * Redirect from default to the global checkout page
	 *
	 * @since 1.10.0
	 */
	public function global_checkout_template_redirect() {

if ( wcf()->utils->is_step_post_type() ) {
			return;
		}

if ( is_product() || ! is_checkout() || is_order_received_page() || is_checkout_pay_page() ) {
			return;
		}

// Return if the key OR Order parameter is found in the URL for certain Payment gateways.
		if ( $this->should_show_global_checkout() ) {
			return;
		}

// redirect only for cartflows checkout pages.
		$common = Cartflows_Helper::get_common_settings();

$global_checkout          = $common['global_checkout'];
		$override_global_checkout = $common['override_global_checkout'];

if ( ! empty( $global_checkout ) && 'enable' !== $override_global_checkout ) {

$link = apply_filters( 'cartflows_global_checkout_url', get_permalink( $global_checkout ) );

if ( ! empty( $link ) ) {

wp_safe_redirect( $link );
				exit;
			}
		}
	}

/**
	 * Decide weather to show the global checkout page or not.
	 *
	 * @since 2.0.3
	 *
	 * @return bool
	 */
	public static function should_show_global_checkout() {
		global $post;
		$checkout_id = ! empty( $post ) && ! empty( $post->ID ) ? intval( $post->ID ) : 0;

$is_allow = ( isset( $_GET['key'] ) || isset( $_GET['order'] ) ); //phpcs:ignore WordPress.Security.NonceVerification.Recommended
		return apply_filters( 'cartflows_allow_display_global_checkout', $is_allow, $checkout_id );
	}

/**
	 * Override order-pay page with store checkout template.
	 *
	 * @since 2.2.2
	 *
	 * @return void
	 */
	public function maybe_override_order_pay_page() {

if ( ! is_checkout_pay_page() ) {
			return;
		}

if ( wcf()->utils->is_step_post_type() ) {
			return;
		}

$common = Cartflows_Helper::get_common_settings();

$global_checkout          = $common['global_checkout'];
		$override_global_checkout = $common['override_global_checkout'];
		$override_store_order_pay = $common['override_store_order_pay'];

if ( empty( $global_checkout ) || 'enable' !== $override_global_checkout || 'enable' !== $override_store_order_pay ) {
			return;
		}

// Ensure this is the store checkout and not a funnel.
		$store_checkout = Cartflows_Helper::get_global_setting( '_cartflows_store_checkout' );

if ( empty( $store_checkout ) ) {
			return;
		}

$flow_id = wcf()->utils->get_flow_id_from_step_id( $global_checkout );

if ( intval( $store_checkout ) !== intval( $flow_id ) ) {
			return;
		}

$checkout_post = get_post( $global_checkout );

if ( ! $checkout_post || 'publish' !== $checkout_post->post_status ) {
			return;
		}

if ( isset( $GLOBALS['posts'][0] ) ) {
			$GLOBALS['posts'][0] = $checkout_post; //phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
		}

if ( isset( $GLOBALS['wp_the_query']->post ) ) {
			$GLOBALS['wp_the_query']->post = $checkout_post; //phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
		}

$GLOBALS['post'] = $checkout_post; //phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
	}
}

/**
 *  Kicking this off by calling 'get_instance()' method
 */
Cartflows_Global_Checkout::get_instance();