Developer Documents Three Expo-Supabase GitHub OAuth Failures and Their Fixes

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A developer building an Expo mobile app with Supabase authentication encountered three separate failures while implementing GitHub login. The first issue stemmed from registering a web URL instead of a custom app scheme as the OAuth redirect, leaving the browser session unable to reopen the app after GitHub approval. The second bug involved mishandling the PKCE flow by discarding the code verifier before the callback exchange could complete. A third failure was caused by a typo in the redirect URL, breaking the match required between Supabase and GitHub OAuth settings. The developer has shared the complete working implementation, totalling under 100 lines of code, to help others resolve similar issues faster.

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