Represents the Android-specific options that can be included in an admin.messaging.Message.
Collapse key for the message. Collapse key serves as an identifier for a group of messages that can be collapsed, so that only the last message gets sent when delivery can be resumed. A maximum of four different collapse keys may be active at any given time.
A collection of data fields to be included in the message. All values must
be strings. When provided, overrides any data fields set on the top-level
[key: string]: string
Android notification to be included in the message.
Priority of the message. Must be either
Package name of the application where the registration tokens must match in order to receive the message.