Tell PMPro to wait 15 seconds instead of 5 on AJAX calls. Helps with slow hosts.

pmpro_ajax_timeout.php

<?php
/*
  Add this code to a custom plugin or your active theme's functions.php.
*/
//wait 15 seconds for PMPro AJAX Calls
function my_pmpro_ajax_timeout($timeout) {
  return 15000;
}
add_filter('pmpro_ajax_timeout', 'my_pmpro_ajax_timeout');