Hey there @Bas2 , thanks for posting!
Not exactly. The API identifier is a reference value you would use in your front-end app so the Auth0 server knows what API the access token is granted. Our Quickstarts to understand, walks us through where the API identifier value goes.
Please note that this doesn’t have to be a callable URL as Auth0 will not call your API, it can be a random, tenant-level unique identifier.
Please feel free to notify us if you have other questions about implementing Auth0 into your front-end app so that it calls Auth0 to get a relevant access token!