Adding 'Sign in with Apple' to your Ruby on Rails 7.1 App: A Step-by-Step Guide

I added omniauth-apple to one of my side projects to get 'Sign in with Apple' authentication. I hit a couple of issues that took me a while to fix, so I want to share how I solved them, hoping it saves others some time.Getting StartedI'm working with Rails 7.1 and authentication-zero. My Gemfile already has omniauth and omniauth-rails_csrf_protection because I passed the --omniauthable flag to the authentication-zero generator:.