@Controller
	@RequestMapping("/examples")
	public class ExamplesController {

		private static final String PRIVATE_KEY = "pr_test_tXHm9qV9qV9bjIRHcQr9PLPa";

		@RequestMapping(value = "/examples/custom-form-with-additional-fields", method = GET)
		public String customForm(Model model) {
			return "examples/custom-form";
		}

		@RequestMapping(value = "/examples/custom-form-with-additional-fields/payment", method = POST)
		public String customFormSubmit(Model model, @RequestParam String tokenId) throws IOException {
			model.addAttribute("tokenId", tokenId);

			try (Shift4Gateway shift4Gateway = new Shift4Gateway(PRIVATE_KEY)) {
				ChargeRequest request = new ChargeRequest()
						.amount(2499)
						.currency("USD")
						.card(new CardRequest(tokenId));

				Charge charge = shift4Gateway.createCharge(request);

				model.addAttribute("chargeId", charge.getId());

			} catch (Shift4Exception e) {
				model.addAttribute("errorType", e.getType());
				model.addAttribute("errorCode", e.getCode());
				model.addAttribute("errorMessage", e.getMessage());

				model.addAttribute("chargeId", e.getChargeId());
			}

			return "examples/custom-form";
		}
	}