The Events Calendar - Event Tickets: REST API route error on checkout payment

Overview of the issue

When using The Events Calendar with Event Tickets, you might experience a 404 error during the checkout payment, with the message "No route was found matching the URL and request method".

Workaround

Please, make sure of having a full site backup of your site before proceeding.

• Add the following code to your theme’s functions.php file :

  add_filter( 'rest_url', 'fix_rest_url_double_slash', 5, 4 );
  function fix_rest_url_double_slash( $url, $path, $blog_id, $scheme ) {
  // Replace multiple slashes with one, but keep https://
  return preg_replace( '#(?