Error on POST webhooks endpoint

[samueldepooter]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. POST to https://webhook.api.printdeal.com/webhooks using personal credentials & body as described in the docs
2. See error

Expected behavior
Successfully create a webhook

Screenshots
Error shown is this

{ "message": "One or more parameter values were invalid: Condition parameter type does not match schema type", "code": "ValidationException", "[__type]": "See error.__type for details.", "time": "redacted", "requestId": "EHU1LMF8N4N34UT85MVVJLF0J3VV4KQNSO5AEMVJF66Q9ASUAAJG", "statusCode": 400, "retryable": false, "retryDelay": 2.9098296613711327 }

What's the issue? Simple GET endpoints work as expected