Exceptions do not have message attribute in Python 3.
See [PEP-352](https://peps.python.org/pep-0352/)
Also, and this is my opinion, it doesn't offer any value to re-raise the JSON decode error as something else. I would propose this change too:
```diff
-try:
- webhook_data = json.loads(json_data)
-except (TypeError, ValueError) as ex:
- raise Exception("The passed json_data is not JSON formatted . {}".format(str(ex)))
+webhook_data = json.loads(json_data)
```