{"slug":"calendly-api-v1","name":"Calendly API v1","host":"calendly.com","site":"https://calendly.com","category":"productivity","docsUrl":null,"sources":[{"kind":"archive","url":"https://developer.calendly.com/how-to-migrate-from-api-v1-to-api-v2"}],"url":"https://www.okapi.bot/providers/calendly-api-v1/","json":"https://www.okapi.bot/api/v1/providers/calendly-api-v1.json","breakingChanges":[{"slug":"api-v1-stops-working","api":"calendly-api-v1","title":"API v1 stops working","kind":"version_retirement","outcome":"fails","model":null,"announcedAt":"2025-03-26","effectiveAt":"2025-08-27","scope":null,"calls":["/api/v1/*"],"method":null,"path":"/api/v1/*","source":{"url":"https://developer.calendly.com/how-to-migrate-from-api-v1-to-api-v2","kind":"archive"},"quote":"The v1 API and Webhooks have been retired as of 8/27/25 and are no longer available.","migration":"Move to API v2 at https://api.calendly.com with a personal access token or OAuth; v2 payloads differ from v1.","migrationChange":null,"needsDecision":"API v1 keys do not work with v2: someone must create a personal access token or an OAuth app.","text":{"summary":"On August 27, 2025, Calendly retired API v1, making all /api/v1/* calls no longer available. Any requests sent to these endpoints after this date fail. The shutdown also retires associated v1 webhooks.","migration":"Migrate to API v2 using a personal access token or OAuth, as API v1 keys do not work with v2. Because v2 payloads differ from v1, moving requires updating your authentication setup and adapting your request and response structures.","by":"writer"},"publishedAt":"2026-10-23T10:40:12.087Z","updatedAt":"2026-10-24T20:33:00.109Z","status":"in_effect","tone":"broken","url":"https://www.okapi.bot/providers/calendly-api-v1/breaking-changes/api-v1-stops-working/"}]}