code: def content_type(self, content_type):
          
          allowed_values = ["application/json", "text/html", "text/plain", "application/x-www-form-urlencoded", ""]  # noqa: E501
          if content_type not in allowed_values:
              raise ValueError(
                  "Invalid value for `content_type` ({0}), must be one of {1}"  # noqa: E501
                  .format(content_type, allowed_values)
              )
  
          self._content_type = content_type
docs: Sets the content_type of this Notificant.
  
          The value of the Content-Type header of the webhook POST request.  # noqa: E501
  
          :param content_type: The content_type of this Notificant.  # noqa: E501
          :type: str