F

FirebaseMessaging	Top level Firebase Cloud Messaging singleton that provides methods for subscribing to topics and sending upstream messages.
FirebaseMessagingService	Base class for receiving messages from Firebase Cloud Messaging.

R

RemoteMessage	A remote Firebase Message.
RemoteMessage.Builder	Builder object for constructing RemoteMessage instances.
RemoteMessage.MessagePriority	Priority of the message
RemoteMessage.Notification	Remote Firebase notification details.

S

SendException

Firebase message send exception.