I'm trying to setup my endpoint for the Account Deletion/Closure Notifications.
I do enter a valid endpoint, but I still get the error. "Please use a valid secure https endpoint (https://domain/path) for the Marketplace account deletion notification endpoint"
My endpoint is indeed valid and secured via ssl (LetsEncrypt)
At first, as I expect a JSON payload, I was returning a HTTP 400 response. I also tried HTTP 200 response but I still get the same error.
Any idea ?