OAuth 2.0 + OIDC + PKCE Explained: From Login to API Access 🔐
What actually happens behind the scenes when you click “Sign in”?
I created this visual data-flow diagram to break down the complete journey:
User → Identity Provider → Authorization Code → PKCE → Tokens → API → Resource Server
If you're learning OAuth 2.0, OIDC, or API security, this diagram should make the flow much easier to understand.
Which part of the OAuth flow do you find most confusing?
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