text: """Simple event listener for example producer app with callbacks."""
  
  from wpwithin_python import AbstractEventListener
  
  
  class EventListener(AbstractEventListener):
      """Simple event listener for example producer app with callbacks."""
  
      def beginServiceDelivery(self, service_id, service_delivery_token, units_to_supply):
          print("Begin Service Delivery")
          print("Service ID: {0}".format(service_id))
          print("Units to supply: {0}".format(units_to_supply))
          print("Service delivery token: {0}".format(service_delivery_token))
  
      def endServiceDelivery(self, service_id, service_delivery_token, units_received):
          print("End Service Delivery")
          print("Service ID: {0}".format(service_id))
          print("Units to supply: {0}".format(units_received))
          print("Service delivery token: {0}".format(service_delivery_token))
  