File parameter

File parameter should be used to provide an attachment that will be uploaded to the Credit Clear platform.

By default, it expects binary content without any encoding.

// other parts of the request
// --foo is used as "boundary" request parameter
--foo--
Content-Disposition: form-data; name="File"; filename="any-file-name.pdf"
Content-Type: application/pdf

// attachment content in binary format

--foo--
// other parts of the request

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Attachment signature validation

Attachment must have valid signature, otherwise it will be rejected.

There is nothing special you need to do - usually each attachment already contains the required signature.