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There are situations where you might need to set an expiration date for the signature request. For example, imagine a quote for a service that is valid for 30 days. This proposal has to be signed by a certain date, and if not, the signature request for the quote is no longer valid. All you need to do is pass the days_valid parameter. For example: 
curl --location 'https://api.box.com/2.0/sign_requests' \
    --header 'Content-Type: application/json' \
    --header 'Authorization: Bearer ej...3t' \
    --data-raw '{
      "days_valid": 30,
      "parent_folder": {
        "id": "234102987614",
        "type": "folder"
      },
      "source_files": [
        {
          "id": "1358047520478",
          "type": "file"
        }
      ],
      "signers": [
        {
          "email": "[email protected]",
          "role": "signer"
        }
      ]
    }'