Design the authentication flow for a public API offering both API keys and OAuth 2.0. When would you recommend each, and how do you communicate which scopes or permissions are missing?

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Stay specific. One example, told well, beats three told fast. Make your decisions visible — what you chose between. End on what changed, for whom.

Design the authentication flow for a public API offering both API keys and OAuth 2.0. When would you recommend each, and how do you communicate which scopes or permissions are missing?

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