API changelog

Track contract, behavior, documentation, and deprecation changes to the SellApp API.

Filter the machine-readable feed at /docs/api-changelog.json by category, api_versions, or breaking.

2026-08-30

Added X-Request-ID to every API response and structured error metadata.
Documented the 60-request-per-minute limit and rate-limit headers.
Added stable id and created_at metadata to seller webhook event payloads.
Marked retired v1 listing and invoice operations as deprecated with v2 replacements.
Clarified OpenAPI document releases and URL compatibility versions.
Added quickstart, testing, retry, idempotency, rate-limit, versioning, and workflow guides.