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Developer Documents Multi-Day AWS Lambda and X API OAuth Integration Battle

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A software developer set out to build an autonomous AI-powered content engine on AWS that could generate and post Wizarding World-themed content to X without human involvement. What appeared to be a simple weekend project — posting a single tweet from AWS Lambda — quickly became a complex struggle with X's multiple authentication methods. The developer initially used a Bearer Token, which returned 403 Forbidden errors, before discovering that posting tweets requires OAuth 2.0 User Context credentials representing an actual user, not just an application. A breakthrough came when switching from the tweet endpoint to a user-verification endpoint, which confirmed successful authentication for the first time. However, a new obstacle emerged when media uploads continued to fail with 403 errors, pointing to yet another layer of API permission requirements.

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Developer Documents Multi-Day AWS Lambda and X API OAuth Integration Battle · ShortSingh