old_contents: #!/usr/bin/env python
  
  from iris_sdk.models.maps.base_map import BaseMap
  
  class SubscriptionMap(BaseMap):
  
      subscription_id = None
      order_id = None
      order_type = None
      email_subscription = None
new_contents: #!/usr/bin/env python
  
  from iris_sdk.models.maps.base_map import BaseMap
  
  class SubscriptionMap(BaseMap):
  
      subscription_id = None
      order_id = None
      order_type = None
      email_subscription = None
      callback_subscription = None
subject: Allow creating a subscription with a callback url