SmsCenter center = new SmsCenterImpl(
    new HttpClientOkHttp(),
    new JsonMapperJackson(),
    "demo", "demo1".toCharArray()
);
MessageSend send = center
    .messages()
    .send(new Message()
        .withContact(Contact.phone("79051234567"))
        .withText("SMS text")
);
System.out.println(String.format(
    "Sent %d messages with total cost %.2f, current balance is %.2f",
    send.getCnt(), send.getCost(), send.getBalance()
));