MerchantConfig config = new MerchantConfig("YOUR_CODE", "YOUR_SECRET", MerchantPlatform.TR);

Order order = new Order("123");
order.setBackRef("http://your.path.to/return");

Product product1 = new Product("Product 1", "PRD1", 10.0, PricesCurrency.TRY);
Product product2 = new Product("Product 2", "PRD2", 12.0, PricesCurrency.TRY);

// adding products to order
order.addProduct(product1);
order.addProduct(product2);

Billing billing = new Billing("TAS", "Yavuz", "TR");
billing.setEmail("email@mymail.com");
// billing.setPhone("123123123");

Address address = new Address("Somewhere in Turkey line 1", "Somewhere in Turkey line 2", "06100", "ANKARA", "ANKARA");
billing.setAddress(address);

// set billing to order
order.setBilling(billing);

Delivery delivery = new Delivery("TAS", "Yavuz", "TR");
delivery.setAddress(address);
delivery.setCompany("ACME");

// set delivery to order
order.setDelivery(delivery);

// you can create card with payu one click payment tokens
Card card = new Card("OneClickPaymentToken");

// and also with cvv
card = new Card("OneClickPaymentToken", "123");

// or directly with real card details
card = new Card("4355084355084358", "11", "2015", "123", "Yavuz TAS");

// user with shoppers ip and shoppers browser time in UTC format
User user = new User("127.0.0.1", "2015-05-27 13:31:52");

// initiate payu client with config
PayuClient client = new PayuClient(config);

// try payment with given order, card and user
PayuResponse response = client.pay(order, card, user);

// can check response hash if needed
if (!client.checkResponseHash(response)) {
    System.out.println("Response coming from Payu is not valid !, http response might be changed on the fly :)");
}

System.out.println("Response status: " + response.getStatus());
System.out.println("Response code: " + response.getReturnCode());
System.out.println("Response message: " + response.getReturnMessage());
System.out.println("Is 3D Secure ?: " + response.is3DSecure());