API errors

concurrent_modification

The resource changed while the request ran.

409application/problem+json

What it means

Another request changed the same resource at the same time, so this one was not applied.

409 · application/problem+json

{
  "type": "https://developers.firsty.app/errors/concurrent_modification",
  "title": "Conflict",
  "status": 409,
  "detail": "The resource changed during this request; re-fetch it and retry",
  "code": "concurrent_modification"
}

How to handle it

Re-fetch the resource and retry with a fresh X-Idempotency-Key.

Errors reference