You will need to notify Realex that the Beds24 response URL is https://www.beds24.com/api/realex.com/response.php
To configure the response URL on your Realex account please Please email the details to
[email protected] to a member of the Realex support desk. Please note that all changes must be submitted by email by anauthorised contact on your account. Please allow 24 hours for any account configuration changes.