How to use Sign in with Apple on iPhone, iPad, and Mac - 9to5Mac - Michael Potuck
October 26, 2019
Sign in with Apple arrives as a seamless way to sign up for and log in to third-party accounts with just your Apple ID
https://9to5mac.com/2019/10/15/how-to-use-sign-in-with-apple-iphone-ipad-mac/