Versioning and changelog
Understand contract versions and evidence-backed release notes.
On this page
Version the contract your application depends on, not just its URL.
Authentication release
The initial contract is the authentication-only check and its identity response. Local implementation, a passing test, a deployed route and accepted customer behavior are separate milestones. This page does not claim a production release that has not been verified.
Planned business contracts
Future business schemas must preserve immutable inputs, artifact versions, lifecycle semantics and authorization. A renamed field, changed idempotency comparison or different partial-result meaning can be a compatibility change even if the path stays the same.
Existing public gateway names and aliases require deliberate compatibility decisions. Documentation must not silently revive retired operations or imply that every historical name is supported.
Changelog discipline
Publish changes with their date, audience, affected contract and migration action. Distinguish a new guide from a new API capability, and a configuration change from customer acceptance.
No business API or operational integration launch is announced in this documentation release.
Upgrade checklist
Read the relevant contract and examples, test in an approved isolated environment, and review changed permissions and cost boundaries. Never verify an upgrade by replaying historical uncertain provider work or using real payments without authorization.