Give temporary access to anyone with a special phrase / code to Paid Memberships Pro restricted content

give-access-to-anyone-with-a-code-passphrase-pmpro.php

<?php
/**
 * This will allow any post or feed to be open if a user has a special passphrase or key.
 * Please change 'abc' to a special passphrase/secret key and change this regularly.
 * This will open any restricted post if a parameter of `&my-key=abc` is passed in the URL, for example my-site.com/feed/?my-key=abc
 * Add this code to your PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */


function my_pmpro_rss_access_filter($hasaccess, $mypost, $myuser, $post_membership_levels) {

	// Some special key, don't share with everyone. Be sure to change this value regularly.
	if( $_REQUEST['my-key'] === 'abc' ){
		$hasaccess = true;
	}

	return $hasaccess;
}
add_filter('pmpro_has_membership_access_filter', 'my_pmpro_rss_access_filter', 10, 4);