Courier Firebase overrides

request.json

{
  "data": {
    "name": "Joshua"
  },
  "event": "my-event",
  "recipient": "josh",
  "override": {
    "firebase-fcm": {
      "body": {
        "data": {
          "my-value": "abc123"
        },
        "webpush": {
          "fcm_options": {
            "link": "https://my.link.here/?test=123"
          }
        }
      }
    }
  }
}