title: Ionic Capacitor One-To-One Chat Notification
body: <p>Here's the thing:</p>
  <hr />
  <p>I've made an one-to-one private chat with ionic capacitor, saving messages in Cloud Firestore. By far it's working fine. Both users can send and recieve messages.
  On the other hand, I've made push notification with FCM(Firebase Cloud Messaging) according to official document of capacitor(<a href="https://capacitorjs.com/docs/guides/push-notifications-firebase" rel="nofollow noreferrer">https://capacitorjs.com/docs/guides/push-notifications-firebase</a>) and from console of Firebase I can publish notificationes to certain device as I've got their tokens.</p>
  <hr />
  <p>So, can I implement message notification using FCM as well when a user recieve a new message? Just like whatsapp, wechat o others common chat apps.</p>
  <p>Attention: I'm using Ionic <strong>Capacitor</strong> + Angular. <strong>NOT cordova</strong>.</p>