Changelog

Every breaking and additive API change. Tagged with the deploy commit (see GIT_REV in response headers).

2026-04-17added

Developer portal launched

dev.zyndpay.io is now the canonical home for API docs, SDK guides, webhook signature examples, and the error code catalog. Swagger remains the OpenAPI source of truth and is mirrored into the API reference section.

2026-04-10added

Per-merchant resource usage limits

Endpoints now enforce abuse-protection quotas (issue #198). Exceeding a quota returns RATE_LIMITED with a Retry-After header.

2026-04-05added

Dispute escalation workflow

dispute.opened and dispute.escalated webhook events added (issue #200).

2026-03-28breaking

Circuit breaker on Chainalysis

Upstream compliance calls now fail closed (issue #240). Expect COMPLIANCE_HOLD rather than a silent pass when Chainalysis is degraded.

2026-03-20added

Invoice and receipt generation

GET /v1/invoices/:id/pdf returns a signed, printable invoice (issue #197).