e-Faktura API

Rate limits

Every response carries the IETF draft rate-limit headers:

RateLimit-Limit: 600
RateLimit-Remaining: 587
RateLimit-Reset: 42

The default is 600 requests/minute per API key or OAuth client, on a sliding window, plus a ceiling across your whole account. Going over returns 429 rate_limited with a Retry-After header (seconds).

UJP’s own limit

UJP itself allows only 1 request per second per EUJP-ID (per legal entity). You never have to manage this yourself: every document call is queued and drained at that rate automatically, independent of the API rate limit above — issuing 50 invoices in a burst just means the last one clears the queue a little later, not a rejected request. If UJP itself returns a rate-limit response, Merot honours its Retry-After and does not count that as one of your filing attempts.