Prefill links
Prepare a short-lived signing link with allowed values. The participant reviews and completes the form before submission.
Read the implementation guideCreate a prefilled signing link
/v1/prefill-linksMints a single-use link that opens the template's public signing page with values already filled in. The signer can change anything that was filled in for them; nothing is locked. values is validated against the template's active version with the same per-field rules a submission gets, minus required. a prefill is partial by design. and signature, initials, and photo/ID capture blocks are never prefillable. The waiver produced by the link is sourced prefill and carries tags. Defaults to expiring in 72 hours; 720 (30 days) is the maximum.
Retrieve a prefill link and usage status
/v1/prefill-links/{id}One prefill link. A non-null usedAt means the link has been signed against and will no longer prefill anything. Read with prefill:write. there is no separate read scope, and the response carries the link's own token.
Before you connect
Use the scopes shown on each endpoint. Read the response schema and common errors, and keep mutations separate from diagnostic read requests.
AuthenticationError handlingOpenAPI contract