post https://api.woleet.io/v1/signatureRequest
Use this operation to create a new signature request.
The properties id, created and lastModified are read-only and so must not be provided: they are managed by the platform and added to the returned request.
Only the properties name and hashToSign are required: the hashToSign property must be the SHA256 hash of the file to sign.
Be sure to have at least 1 signature request credit, plus enough signature and SMS credits to fulfill the signature request.