send method
Sends the given message via FCM.
message- The message payload.dryRun- Whether to send the message in the dry-run (validation only) mode.
Returns a unique message ID string after the message has been successfully handed off to the FCM service for delivery.
Implementation
Future<String> send(Message message, {bool? dryRun}) {
return _requestHandler.send(message, dryRun: dryRun);
}