curl -X POST 'https://api.sendforsign.com/api/user' \
     -H 'Authorization: Bearer 123456789' \
     -H 'Content-Type: application/json' \
     -d '{ 
		  "data": {
				   "action": "update",
				   "user": {
							  "userKey": "USER_KEY",
							  "fullname": "John Johnson",
							  "email": "john_johnson@mail.com", 
							  "customKey": "YOUR_COMBINATION"
						    }
				  }
       }'

	{
       "user": {
                "changeTime": "2023-12-01 12:18:55",
                "userKey": "USER_KEY", 
		},
       "code": "201",
       "message": "User updated"
    }