curl --request POST \
  --url https://{operatorDomain}/v1/public/legal/contracts/{id}/sign \
  --header 'Content-Type: application/json' \
  --data '
{
  "signerName": "<string>",
  "signerEmail": "jsmith@example.com",
  "signerRole": "<string>",
  "signatureData": "<string>"
}
'

{
  "data": {
    "signature": {
      "id": "<string>",
      "signerName": "<string>",
      "contractId": "<string>",
      "signedAt": "2023-11-07T05:31:56Z"
    }
  }
}