GET /api/v1/envelopes/{envelopeId}/files — Download Envelope Files

Download all files associated with an envelope. Returns file content as binary or base64 depending on the Accept header.

{
  "data": {
    "files": [
      {
        "fileId": "f1a2b3c4-d5e6-7890-abcd-ef1234567890",
        "fileName": "contract.pdf"
      }
    ]
  },
  "errorCode": 0,
  "message": "Success",
  "returnUrl": null,
  "stateValidationErrors": null,
  "signature": ""
}

{
  "data": null,
  "errorCode": 404,
  "message": "Envelope not found",
  "returnUrl": null,
  "stateValidationErrors": null,
  "signature": ""
}