code: def data(self):
          '''Returns data formatted for a POST request to the Postmark send API.
  
          :rtype: `dict`
          '''
          d = {}
          for val, key in self._fields.items():
              val = getattr(self, val)
              if val is not None:
                  d[key] = val
          return f data(self):
          '''Returns data formatted for a POST request to the Postmark send API.
  
          :rtype: `dict`
          '''
          d = {}
          for val, key in self._fields.items():
              val = getattr(self, val)
              if val is not None:
                  d[key] = val
          return d
docs: Returns data formatted for a POST request to the Postmark send API.
  
          :rtype: `dict`