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Signkoi
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Changelog

Changes to the Signkoi API, newest first.

Every response carries the Signkoi-Version header. Additive changes (new endpoints, optional parameters, fields, events and error codes) can arrive at any time within a version; breaking changes only ever come with a new version and advance notice.

2026-11-14 — v1

Initial release

The first public version of the Signkoi API.

  • API keys with scopes (envelopes, templates, webhooks, account), expiry, and per-key rate limits by plan.
  • Envelopes: create from PDFs (multipart or base64 JSON) with recipients, fields and metadata; update drafts; send, remind, void and delete; correct recipients and resend invitations; audit trail; download the original, signed PDF and certificate.
  • Embedded and in-person signing with signing URLs.
  • Templates: list, retrieve and create envelopes by filling roles.
  • Webhooks: manage endpoints, rotate secrets, send test events and inspect deliveries; payloads gain api_version, data.envelope and data.document.metadata.
  • Idempotency keys on every POST, a single error format with stable codes, request ids, and an OpenAPI 3.1 spec.