C# Implementation of the new HTTP v1 API protocol of Firebase Cloud Messaging (FCM) which is:

the most up to date, with more secure authorization and flexible cross-platform messaging capabilities

Note that if you want to use upstream messaging from your client applications, you must use XMPP

Before you send your first message you require a credential file given by Firebase:

• In the Firebase console, open Settings > Service Accounts.
• Click Generate New Private Key, and confirm by clicking Generate Key.
• Download and save the file to a secure location

Once you have your server key and credentials, instatiate a client object with:

FCMClient client = new FCMClient("relative-path-to-credential-file");

Create a simle message and send it:

Message message = new Message
  .Builder()
  .ToTopic("news")
  .Title("my title")
  .Body("my body")
  .Build();

string id = await client.Send(message);

More details about FCM messages can be found in the product documentation at:

• https://firebase.google.com/docs/cloud-messaging/concept-options
• https://firebase.google.com/docs/cloud-messaging/server?hl=en-us#implementing-http-connection-server-protocol

You know how to do it! Fork it, branch it, change it, commit it, and pull-request it. We are passionate about improving this project, and glad to accept help to make it better.