Paypal添加到购物车按钮 - 如何使用Java生成？

   <groupId>com.paypal.sdk</groupId>
   <artifactId>rest-api-sdk</artifactId>
   <version>1.14.0</version>
</dependency>

implementation 'com.paypal.sdk:rest-api-sdk:1.14.0'

acct1.ClientId=YOUR_CLIENT_ID
acct1.ClientSecret=YOUR_CLIENT_SECRET

import com.paypal.api.payments.Payment;
import com.paypal.base.rest.PayPalRESTException;

public class PaypalButtonGenerator {
    public static String generatePaypalButton(String itemName, String itemPrice) {
        Payment payment = new Payment();
        // 设置支付金额和货币
        payment.setTransactions(Arrays.asList(new Transaction().setAmount(new Amount().setCurrency("USD").setTotal(itemPrice))));
        // 设置支付方式
        payment.setIntent("sale");
        // 设置支付方式为Paypal
        payment.setPayer(new Payer().setPaymentMethod("paypal"));
        // 设置回调URL
        RedirectUrls redirectUrls = new RedirectUrls();
        redirectUrls.setReturnUrl("http://example.com/return");
        redirectUrls.setCancelUrl("http://example.com/cancel");
        payment.setRedirectUrls(redirectUrls);
        try {
            // 调用Paypal API生成支付链接
            Payment createdPayment = payment.create(apiContext);
            // 生成HTML代码
            String approvalUrl = createdPayment.getApprovalLink();
            return "<form action=\"" + approvalUrl + "\" method=\"post\<input type=\"submit\" value=\"Add to Cart\"/></form>";
        } catch (PayPalRESTException e) {
            e.printStackTrace();
            return null;
        }
    }
}