Use this operation to download the file to be signed for a signature request.

If the signature request is CLOSED or COMPLETED and the signed file is a PDF document that was uploaded to Woleet, this operation can also be used to download the amended document:
this document is basically the signed file concatenated with the Signature Attestation document. The amended document contains the proof bundle as attachment, and is certified by Woleet.

The name of the file is included in the Content-Disposition header (see https://www.ietf.org/rfc/rfc6266.txt).

This is a publicly accessible endpoint: authentication is not required to download the file to be signed for a signature request (but its identifier needs to be known).