This is a part of notification define who get the notification.
|Registration ids||Array||A unique token string that identifies each client app instance. The registration token is required for single device and device group messaging. Note that registration tokens must be kept secret.|
|Email/Merge tag||String||Is email or dynamic information from variable|
|Topic||String||The name of topic devices subscribed|
Noted: Cirilla default subscribe to topic “android” or “ios”