A practical walkthrough of using the FourSquare/Swarm API to automatically cross-post location check-ins to Mastodon and BlueSky. Covers OAuth authentication flow, posting new check-ins, retrieving existing check-ins, finding venue IDs via the Places API, and handling photo attachments. The author shares a Python script (SwarmToSocial) that polls every 15 minutes for new check-ins and syndicates them to social platforms, bypassing Swarm's walled-garden approach.
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