Disable Caching for Event Espresso pages
If WP Engine is your host you will need to ask WP Engine support to disable caching for the pages that handle Event Espresso events and registration checkout. The URLs that need to be excluded from the cache may include:
/events/
/registration-checkout/
/event-registration/
/transactions/
/thank-you/
/registration-cancelled/
Important: Your site’s event and registration checkout URLs may be different, and you can refer to the pages listed in Event Espresso > General Settings > Critical page settings to verify which pages need to be excluded from the cache.
In addition to the above, any page or post that’s set to display a ticket selector using the [ESPRESSO_TICKET_SELECTOR] shortcode must also have caching disabled.
Using Event Espresso 4 with WP Engine? View a sample message that you can share with the support team at WP Engine.
Using Event Espresso 3? Try this message instead.
Enable the Heartbeat API
WP Engine will also by default disable the built-in WordPress Heartbeat API. This will break the Event Espresso 4 advanced ticket editor functions and will also break the automatic payment status update feature on the EE4 payment page. In Event Espresso 3, you will see issues with the Payment gateway settings boxes not allowing you to open and close them. The above issues are caused by the missing WordPress Heartbeat scripts. To fix this, you can also put in a request with WP Engine support to enable the Heartbeat API scripts.
Since there may be a delay before WP Engine can re-enable the Heartbeat API scripts, there’s a temporary workaround you can use that’s published in this gist: