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