/// Construct a new V3 message sender.
Construct a new V3 message sender.
Construct a new V3 message sender .
pub fn new(api_key: String) -> Sender {
        Sender {
            api_key,
            client: Client::new(),
        }
    }
pub fn new ( api_key : String ) -> Sender { Sender { api_key , client : Client :: new ( ) , } }
Construct a new V3 message sender.
Construct a new V3 message sender .
api_key
String