I'm sure I was using the same API key - I only had the one... but I was probably doing something wrong. After a night's sleep I tried it again and it worked as expected. Thanks for the reply!

Greetings, I have a development store where I registred a few webhooks, using the API. The response from the API contained IDs for them and if I try to a new POST with the same data I get a response saying "address": ["for this topic has already be...