Sign in with Apple
summary
Apple now requires Sign in with Apple as an option for many App Store apps, mandatory by April 2020. Implementation uses the OIDC authorization code flow with minor changes and the AuthenticationServices framework. Steps are explicit: register and verify domain, enable Sign in with Apple on an App ID, create a Service ID and exact redirect URIs, then download p8 once to use as the private key. UI specifics include a native button placed above others and the hide my email proxy-address feature; adoption is rising after slow uptake.
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