We didn't receive any notification/callback/IPN data or how can see the data/request body posted to the webhook URL
Create a callback URL from https://webhook.site or https://beeceptor.com/
and use it as a callback URL.
Run your tests and all the details of the callback request will be displayed on that webhook.site or beeceptor.com interface depending on the one you used.
It will also help you see what we POST before implementing your side.
It also helps to confirm that it's your side that needs to be corrected to receive the data posted