code: def get_instance(self, payload):
          
          return AssignedAddOnExtensionInstance(
              self._version,
              payload,
              account_sid=self._solution['account_sid'],
              resource_sid=self._solution['resource_sid'],
              assigned_add_on_sid=self._solution['assigned_add_on_sid'],
          )
docs: Build an instance of AssignedAddOnExtensionInstance
  
          :param dict payload: Payload response from the API
  
          :returns: twilio.rest.api.v2010.account.incoming_phone_number.assigned_add_on.assigned_add_on_extension.AssignedAddOnExtensionInstance
          :rtype: twilio.rest.api.v2010.account.incoming_phone_number.assigned_add_on.assigned_add_on_extension.AssignedAddOnExtensionInstance