curl -X POST 'https://api.sendforsign.com/api/client' \
     -H 'X-Sendforsign-Key: YOUR_API_KEY' \
     -H 'Content-Type: application/json' \
     -d '{ 
		  "data": {
				   "action": "update",
				   "client": {
							  "clientKey": "CLIENT_KEY",
							  "fullname": "John Johnson",
							  "email": "john_johnson@mail.com",
							  "organization": "Company Inc.",
							  "customKey": "YOUR_COMBINATION"
						     }
				  }
       }'

	  {
       "client": {
                "changeTime": "2023-12-01 12:18:55",
                "clientKey": "CLIENT_KEY", 
		},
       "code": "201",
       "message": "Client updated"
    }