如何在Spring Mvc中集成instamojo支付网关，实际集成代码缺失

<dependency>
    <groupId>com.instamojo</groupId>
    <artifactId>instamojo-java</artifactId>
    <version>1.4.0</version>
</dependency>

import com.instamojo.wrapper.Instamojo;
import com.instamojo.wrapper.api.InstamojoImpl;
import com.instamojo.wrapper.exception.ConnectionException;
import com.instamojo.wrapper.exception.InvalidPaymentOrderException;
import com.instamojo.wrapper.model.PaymentOrder;
import com.instamojo.wrapper.model.PaymentOrderResponse;

public class InstamojoService {
    private static final String API_KEY = "YOUR_API_KEY";
    private static final String AUTH_TOKEN = "YOUR_AUTH_TOKEN";
    private static final boolean TEST_MODE = true; // Set it to false for production

    private Instamojo instamojo;

    public InstamojoService() {
        instamojo = new InstamojoImpl(API_KEY, AUTH_TOKEN, TEST_MODE);
    }

    public String createPaymentOrder(String buyerName, String buyerEmail, double amount, String purpose, String redirectUrl) throws ConnectionException, InvalidPaymentOrderException {
        PaymentOrder order = new PaymentOrder();
        order.setName(buyerName);
        order.setEmail(buyerEmail);
        order.setAmount(amount);
        order.setCurrency("INR");
        order.setDescription(purpose);
        order.setRedirectUrl(redirectUrl);

        PaymentOrderResponse response = instamojo.createPaymentOrder(order);
        return response.getPaymentOptions().getPaymentUrl();
    }
}

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;

@Controller
public class PaymentController {
    private InstamojoService instamojoService = new InstamojoService();

    @GetMapping("/payment")
    public String initiatePayment(Model model) {
        try {
            String paymentUrl = instamojoService.createPaymentOrder("John Doe", "john.doe@example.com", 100.0, "Product Purchase", "http://your-website.com/payment/success");
            model.addAttribute("paymentUrl", paymentUrl);
        } catch (Exception e) {
            // Handle exception
        }
        return "payment";
    }
}