# Changelog

## 1.1.0 — revision 2026-09-19

Backward-compatible additions and correctness clarifications:

- optional per-delivery `webhook.url` with global fallback and polling precedence;
- immutable callback/idempotency and multi-brand isolation requirements;
- optional `eventType` discriminator with nine standardized event values;
- explicit driver-location and ETA event rules;
- complete status, errors, 429/Retry-After, timeout, retry, replay, and ordering rules;
- provider-only OpenAPI, public examples, signing guides, and black-box certification suite;
- proof of delivery explicitly unavailable in this revision.


## 1.0.0 — initial revision

Initial create, update, status, tracking, cancellation, return, test, webhook payload, HMAC, and status vocabulary.

## Versioning policy

Semantic minor/patch releases may add optional fields or clarify existing requirements. Breaking wire, authentication, signature, required-field, endpoint, or status-semantic changes require a new API major and recertification. Providers should state both semantic version and revision in conformance reports.