Webhook to AWS API Gateway problems (Missing Authentication Token)

Hi all,
I’m trying to send my data to an AWS API Gateway using a webhook. I found a couple of threads where users reported to use this method to get data into aws. Unfortunately there was no instructions/tutorial/hint of how they archieved this. :frowning:

For the API Gateway in AWS I made a REST API with a resource and a PUT methode. I also activated the “API key required” because I want to secure it:

Then I created the webhook in the Particle Cloud. I followed this instruction:

and added my API Endpoint and my key which I also created in AWS.

Webhook looks like following:

When testing the webhook I always get this result:

{"message":"Missing Authentication Token"}

Any hints?

Thanks and best regards,