code: def push_app(self, content, content_url=None):
          '''Push a notification to a Pushed application.
  
          Param: content -> content of Pushed notification message
                 content_url (optional) -> enrich message with URL
          Returns Shipment ID as string
          '''
          parameters = {
              'app_key': self.app_key,
              'app_secret': self.app_secret
          }
          return self._push(content, 'app', parameters, content_urlf push_app(self, content, content_url=None):
          '''Push a notification to a Pushed application.
  
          Param: content -> content of Pushed notification message
                 content_url (optional) -> enrich message with URL
          Returns Shipment ID as string
          '''
          parameters = {
              'app_key': self.app_key,
              'app_secret': self.app_secret
          }
          return self._push(content, 'app', parameters, content_url)
docs: Push a notification to a Pushed application.
  
          Param: content -> content of Pushed notification message
                 content_url (optional) -> enrich message with URL
          Returns Shipment ID as string