IDfier Sign API
Let your users sign contracts with a verified identity, without leaving your product's flow.
One REST call creates the contract; IDfier verifies every signer and seals the result. It is built for platforms whose own customers sign: marketplaces, rentals, staffing. Your users don't need an IDfier Sign account of their own.
How it works
Create the contract
POST the PDF with the people who should sign it. You get each signer's
personal link back.
Signers verify and sign
They open the link, prove who they are with IDfier, read the document and sign. There is nothing to install on your side.
They come back to you
With a returnUrl, signers land back in your product, with the document id
and the outcome in the URL.
Collect the result
Poll the document until it is completed, then download the sealed PDF and
its certificate.
Base URL and access
https://sign.idfier.com/api/v1The API is part of the Business, Enterprise and API plans. A company owner
or admin creates a key in IDfier Sign under Company → API; send it as
Authorization: Bearer isk_live_…. See Requests.