Sign In With Apple Part 3 - ASAuthorizationAppleIDCredential and ASPasswordCredential 

In this Part 3, we will learn ASAuthorizationAppleIDCredential and ASPasswordCredential in detail. We will see what is contained in the identity token received in ASAuthorizationAppleIDCredential. Also, we will resolve the "No credentials available for login" error in this part.
This entire Sign in With Apple - Demystification series focuses on all the small and important details associated with implementing Sign in with Apple in the client apps and backend.