Pusher
Pusher BEAMS support. See: https://pusher.com/docs/beams.
Example:
let instance_id = var.unwrap;
let secret = var.unwrap;
let pusher = new;
let request = r#"
{"web":{"notification":{"title":"Hello","body":"Hello, world!"}}}
"#;
let payload = Payload ;
pusher.publish.await.unwrap;