Downloads the completed (fully signed) document as a PDF.

This endpoint responds with a 302 redirect to a short-lived signed URL for the file — follow the redirect (most HTTP clients do so automatically, e.g. curl -L) to receive the PDF. If you want the link itself as JSON rather than the file, use GET /papersign/documents/{id}/completed-document-url instead.

The document must be completed — every signer must have finished signing — before it can be downloaded. A draft document returns 400, and a document that has been sent but is not yet completed returns 422. Please note that this feature is exclusively available as part of the Papersign API.