Logic - API Request

Hello everyone,

It’s the first time I use Logic and I have to say that I am stuck…
I don’t know what is wrong with my automation.
I think it is in my body section but I don’t understand the error message to be honest.

Can someone help please? :)

Thanks a lot !

The upper part of the setting →

The body part of my settings. They should all be dynamic, only two of them are set to test.

The error message →

The documentation (which is too simple)