Redirect MEPR IPN URL to the PMPro IPN URL

my_ipn_redirect.php

/*
	Redirect MEPR IPN URL to the PMPro IPN URL, e.g.
	https://yoursite.com/mepr/notify/onibvz-5w6/ipn =>
	https://yoursite.com/wp-admin/admin-ajax.php?action=ipnhandler

	Update line 9 to match the IPN URL given to you by MEPR
*/
function my_ipn_redirect() {	
	if( defined('PMPRO_DIR') && $_SERVER['REQUEST_URI'] === '/mepr/notify/onibvz-5w6/ipn' ) {
		require_once(PMPRO_DIR . "/services/ipnhandler.php");
		exit;
	}
}
add_action('init', 'my_ipn_redirect');