WordPress WeChat Pay integration plugin skeleton

wechat-pay-plugin.php

<?php
/*
Plugin Name: WeChat Pay integration plugin skeleton
Plugin URI: https://gist.github.com/froger-me/2c66a842ef8900b017809d7c738130c9
Description: Requires WP Weixin version min 1.3. A skeleton plugin. NEEDS TO BE EDITED BY A DEVELOPER BEFORE USE!
Version: 1.3
Author: Alexandre Froger
Author URI: https://froger.me
WC tested up to: 3.5.2
*/

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly
}

/*
 * - The skeleton's structure is not optimized, better to use a class than global variables.
 * - The plugin does not do anything on its own, but provides placeholders for custom logic.
 * - The skeleton includes only the placeholders for handling transaction validation after a payment has already been made.
 */

add_action( 'wp_weixin_endpoints', 'wechat_pay_plugin_add_endpoints' );
add_filter( 'query_vars', 'wechat_pay_plugin_add_query_vars', 10, 1 );
add_action( 'parse_request', 'wechat_pay_plugin_parse_request' );
add_action( 'wp_weixin_handle_pay_notification', 'wechat_pay_plugin_handle_pay_notification' );
add_action( 'wp_weixin_handle_auto_refund', 'wechat_pay_plugin_handle_auto_refund', 10, 2 );

function wechat_pay_plugin_add_endpoints() {
	add_rewrite_rule(
		'^wechat-pay-plugin/my-callback/$',
		'index.php?my_callback_var=1',
		'top'
	);
}

function wechat_pay_plugin_add_query_vars( $vars ) {
	$vars[] = 'my_callback_var';

	return $vars;
}

function wechat_pay_plugin_parse_request() {
	global $wp, $wechat_pay_plugin_is_handler;

	if ( isset( $wp->query_vars['my_callback_var'] ) ) {
		$wechat_pay_plugin_is_handler = true;

		do_action( 'wp_weixin_handle_pay_notification' );
	}
}

function wechat_pay_plugin_handle_pay_notification() {
	global $wechat_pay_plugin_payment_result, $wechat_pay_plugin_is_handler;

	$wechat       = wp_weixin_get_wechat();
	$notification = $wechat->getNotify();
	$wechat_error = $wechat->getError();
	$success      = false;
	$refund       = false;
	$more_data    = wechat_pay_plugin_get_more_data( $notification );
	
	$is_wechat_pay_plugin_transaction = wechat_pay_plugin_identify_transaction( $notification );
	
	if ( $is_wechat_pay_plugin_transaction = wechat_pay_plugin_identify_transaction( $notification ) ) {
		$success = true;
	}

	if ( $wechat_error ) {
		$wechat_error = wechat_pay_plugin_get_error_message( $wechat_error );
		$refund       = wechat_pay_plugin_get_wechat_error_refund_message( $notification, $wechat_error );
	} else {

		if ( $is_wechat_pay_plugin_transaction ) {
			$internal_error = wechat_pay_plugin_finalise_transaction( $notification );

			if ( $internal_error ) {
				$refund = wechat_pay_plugin_get_internal_error_refund_message( $notification, $internal_error );
			}
		}
	}

	$wechat_pay_plugin_payment_result = array(
		'success'                => $success,
		'data'                   => $notification,
		'refund'                 => $refund,
		'notify_error'           => ( ! $wechat_error ) ? false : $wechat_error,
		'blog_id'                => get_current_blog_id(),
		'main_handler'           => $wechat_pay_plugin_is_handler,
		'wechat_pay_plugin_data' => $more_data,
	);

	add_filter( 'wp_weixin_pay_notify_results', 'wechat_pay_plugin_add_pay_result', 10, 1 );
}

function wechat_pay_plugin_add_pay_result( $results ) {
	global $wechat_pay_plugin_payment_result;

	if ( is_array( $wechat_pay_plugin_payment_result ) && ! empty( $wechat_pay_plugin_payment_result ) ) {
		$results[] = $wechat_pay_plugin_payment_result;
	}

	return $results;
}

function wechat_pay_plugin_handle_auto_refund( $refund_result, $result_data ) {

	if ( $refund_result && isset( $result_data['wechat_pay_plugin_data'] ) ) {
		wechat_pay_plugin_process_auto_refund_success( $result_data['wechat_pay_plugin_data'] );
	} elseif ( isset( $result_data['wechat_pay_plugin_data'] ) ) {
		wechat_pay_plugin_process_auto_refund_failure( $result_data['wechat_pay_plugin_data'] );
	}
}


function wechat_pay_plugin_get_more_data( $wechat_notification ) {

	return false;
}

function wechat_pay_plugin_get_error_message( $wechat_error ) {

	if ( isset( $wechat_error['code'] ) ) {
		$error_description = $wechat_error['code'] . ': ' . $wechat_error['message'];
	} else {
		$error_description = $wechat_error['message'];
	}

	return $error_description;
}

function wechat_pay_plugin_get_wechat_error_refund_message( $wechat_error ) {

	return true;
}

function wechat_pay_plugin_identify_transaction( $wechat_notification ) {

	return false;
}

function wechat_pay_plugin_finalise_transaction( $wechat_notification ) {

	return false;
}

function wechat_pay_plugin_get_internal_error_refund_message( $wechat_notification, $error ) {

	return true;
}

function wechat_pay_plugin_process_auto_refund_success( $wechat_pay_plugin_data ) {

}

function wechat_pay_plugin_process_auto_refund_failure( $wechat_pay_plugin_data ) {

}