This can occur due to the following:
- Webhook not setup in Live
The webhook register differs between Sandbox (Test) and Live. You'll need to set up your webhooks in Live once your account has been activated.
- Error during processing of event
Upon receiving our webhook event, your service must return an HTTP 20x response (e.g., 200) within 15 seconds. When this is not returned, we consider the message undelivered, and after 10 delivery attempts, we disable your webhook.
As part of best practices, please ensure that your webhook event post-processing logic is not tightly coupled with your event receive/acknowledge logic.