那些遇到过的问题

使用paypal api时无法建立SOAP连接

Jav*_*ava 4 java soap web-services paypal

我正在尝试使用 paypal soap 客户端，并使用 Java参考使用Paypal Express Checkout执行 setExpressCheckout 方法。

所以在这里我只使用 paypal-base.jar 和 paypal-stubs.jar 而不是肥皂客户端（从 wsdl 生成）。

    public class SetExpressCheckoutService{

        private static Logger log = Logger.getLogger(SetExpressCheckoutService.class);

        public static void main(String[] args){
            SetExpressCheckoutService setExpressCheckoutService = new SetExpressCheckoutService();

            //the parameters for the service
            Long userId = 5l;
            String amount = "25";
            String returnURL = "http://localhost:8080/integratingstuff-paypal/return_after_payment.xhtml";
            String cancelURL = "http://localhost:8080/integratingstuff-paypal/cancel_payment.xhtml";
            PaymentActionCodeType paymentAction = PaymentActionCodeType.Sale;
            CurrencyCodeType currencyCode = CurrencyCodeType.EUR;

            try {
                //calling the service, setting up the checkoutpage
                String token = setExpressCheckoutService.setExpressCheckout(userId, amount, currencyCode, returnURL,cancelURL,paymentAction);
                log.info("Url to redirect to: https://www.sandbox.paypal.com/webscr?cmd=_express-checkout&useraction=commit&token=" + token);
            } catch (PayPalException e) {
                log.error(e);
            }
        }

        public String setExpressCheckout(Long userId, String paymentAmount,
                CurrencyCodeType currencyCodeType, String returnURL, String cancelURL,
                    PaymentActionCodeType paymentAction) throws PayPalException{



CallerServices caller = new CallerServices();

            //construct and set the profile, these are the credentials we establish as "the shop" with Paypal
            APIProfile profile = ProfileFactory.createSignatureAPIProfile();
            profile.setAPIUsername("sdk-three_api1.sdk.com");
            profile.setAPIPassword("QFZCWN5HZM8VBG7Q");
            profile.setSignature("AVGidzoSQiGWu.lGj3z15HLczXaaAcK6imHawrjefqgclVwBe8imgCHZ");
            profile.setEnvironment("sandbox");
            caller.setAPIProfile(profile);

            //construct the request
            SetExpressCheckoutRequestType pprequest = new SetExpressCheckoutRequestType();
            pprequest.setVersion("63.0");

            //construct the details for the request
            SetExpressCheckoutRequestDetailsType details = new SetExpressCheckoutRequestDetailsType();

            PaymentDetailsType paymentDetails = new PaymentDetailsType();
            paymentDetails.setOrderDescription("Integrating Stuff Test Order");
            paymentDetails.setInvoiceID("INVOICE-" + Math.random());
            BasicAmountType orderTotal = new BasicAmountType(paymentAmount);
            orderTotal.setCurrencyID(currencyCodeType);
            paymentDetails.setOrderTotal(orderTotal);
            paymentDetails.setPaymentAction(paymentAction);
            details.setPaymentDetails(new PaymentDetailsType[]{paymentDetails});

            details.setReturnURL(returnURL);
            details.setCancelURL(cancelURL);
            details.setCustom(userId.toString());

            //set the details on the request
            pprequest.setSetExpressCheckoutRequestDetails(details);

            //call the actual webservice, passing the constructed request
            SetExpressCheckoutResponseType ppresponse = (SetExpressCheckoutResponseType) caller.call("SetExpressCheckout", pprequest);

            //get the token from the response
            return ppresponse.getToken();
        }
    }
Run Code Online (Sandbox Code Playgroud)

我曾尝试执行此方法，但出现异常
com.paypal.sdk.exceptions.FatalException: Unable to establish SOAP connection

引起：java.lang.NullPointerException at com.paypal.sdk.core.APICallerBase.getEndpointUrl(APICallerBase.java:296)

完整的堆栈跟踪是：

com.paypal.sdk.exceptions.FatalException: Unable to establish SOAP connection
        at com.paypal.sdk.core.soap.SOAPAPICaller.setupConnection(SOAPAPICaller.java:292)
        at com.paypal.sdk.services.CallerServices.setAPIProfile(CallerServices.java:112)
        at com.imedicor.liferay.organizations.util.PaypalService.setExpressCheckout(PaypalService.java:92)
        at com.imedicor.liferay.organizations.util.PaypalService.testing(PaypalService.java:43)
        at org.apache.jsp.organization_005fdetails_jsp._jspService(organization_005fdetails_jsp.java:500)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:72)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:73)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
        at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:593)
        at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:530)
        at com.liferay.portlet.PortletRequestDispatcherImpl.dispatch(PortletRequestDispatcherImpl.java:323)
        at com.liferay.portlet.PortletRequestDispatcherImpl.include(PortletRequestDispatcherImpl.java:134)
        at com.imedicor.liferay.organizations.portlet.OrganizationPortlet.doView(OrganizationPortlet.java:83)
        at com.liferay.portal.kernel.portlet.LiferayPortlet.doDispatch(LiferayPortlet.java:218)
        at com.liferay.util.bridges.mvc.MVCPortlet.doDispatch(MVCPortlet.java:319)
        at javax.portlet.GenericPortlet.render(GenericPortlet.java:233)
        at com.liferay.portlet.FilterChainImpl.doFilter(FilterChainImpl.java:100)
        at com.liferay.portal.kernel.portlet.PortletFilterUtil.doFilter(PortletFilterUtil.java:64)
        at com.liferay.portal.kernel.servlet.PortletServlet.service(PortletServlet.java:111)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:72)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:73)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
        at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:593)
        at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:530)
        at com.liferay.portlet.InvokerPortletImpl.invoke(InvokerPortletImpl.java:534)
        at com.liferay.portlet.InvokerPortletImpl.invokeRender(InvokerPortletImpl.java:607)
        at com.liferay.portlet.InvokerPortletImpl.render(InvokerPortletImpl.java:359)
        at org.apache.jsp.html.portal.render_005fportlet_jsp._jspService(render_005fportlet_jsp.java:1207)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
        at com.liferay.portal.servlet.DirectRequestDispatcher.include(DirectRequestDispatcher.java:97)
        at com.liferay.portal.servlet.PACLRequestDispatcherWrapper.doDispatch(PACLRequestDispatcherWrapper.java:90)
        at com.liferay.portal.servlet.PACLRequestDispatcherWrapper.include(PACLRequestDispatcherWrapper.java:54)
        at com.liferay.portal.util.PortalImpl.renderPortlet(PortalImpl.java:5158)
        at com.liferay.portal.util.PortalUtil.renderPortlet(PortalUtil.java:1569)
        at com.liferay.portlet.layoutconfiguration.util.RuntimePortletImpl.processPortlet(RuntimePortletImpl.java:165)
        at com.liferay.portlet.layoutconfiguration.util.RuntimePortletImpl.processPortlet(RuntimePortletImpl.java:203)
        at com.liferay.portlet.layoutconfiguration.util.RuntimePortletImpl.processPortlet(RuntimePortletImpl.java:190)
        at com.liferay.portlet.layoutconfiguration.util.RuntimePortletUtil.processPortlet(RuntimePortletUtil.java:87)
        at com.liferay.portlet.layoutconfiguration.util.velocity.TemplateProcessor.processMax(TemplateProcessor.java:165)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:389)
        at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:378)
        at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:270)
        at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:262)
        at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:342)
        at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:336)
        at org.apache.velocity.Template.merge(Template.java:328)
        at org.apache.velocity.Template.merge(Template.java:235)
        at org.apache.velocity.app.VelocityEngine.mergeTemplate(VelocityEngine.java:381)
        at com.liferay.portal.velocity.VelocityEngineImpl.mergeTemplate(VelocityEngineImpl.java:264)
        at com.liferay.portal.kernel.velocity.VelocityEngineUtil.mergeTemplate(VelocityEngineUtil.java:73)
        at com.liferay.portlet.layoutconfiguration.util.RuntimePortletImpl.doProcessTemplate(RuntimePortletImpl.java:499)
        at com.liferay.portlet.layoutconfiguration.util.RuntimePortletImpl.doDispatch(RuntimePortletImpl.java:394)
        at com.liferay.portlet.layoutconfiguration.util.RuntimePortletImpl.processTemplate(RuntimePortletImpl.java:228)
        at com.liferay.portlet.layoutconfiguration.util.RuntimePortletUtil.processTemplate(RuntimePortletUtil.java:125)
        at org.apache.jsp.html.portal.layout.view.control_005fpanel_jsp._jspService(control_005fpanel_jsp.java:676)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:72)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:73)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
        at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:593)
        at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:530)
        at com.liferay.portal.action.LayoutAction.includeLayoutContent(LayoutAction.java:468)
        at com.liferay.portal.action.LayoutAction.processLayout(LayoutAction.java:735)
        at com.liferay.portal.action.LayoutAction.execute(LayoutAction.java:249)
        at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
        at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
        at com.liferay.portal.struts.PortalRequestProcessor.process(PortalRequestProcessor.java:187)
        at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
        at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
        at com.liferay.portal.servlet.MainServlet.callParentService(MainServlet.java:560)
        at com.liferay.portal.servlet.MainServlet.service(MainServlet.java:537)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:72)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
        at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163)
        at com.liferay.portal.servlet.filters.secure.SecureFilter.processFilter(SecureFilter.java:294)
        at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:73)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
        at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:471)
        at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:402)
        at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:329)
        at com.liferay.portal.servlet.FriendlyURLServlet.service(FriendlyURLServlet.java:138)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:72)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
        at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163)
        at com.liferay.portal.servlet.filters.strip.StripFilter.processFilter(StripFilter.java:335)
        at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
        at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163)
        at com.liferay.portal.servlet.filters.gzip.GZipFilter.processFilter(GZipFilter.java:123)
        at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108)
        at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163)
        at com.liferay.portal.servlet.filters.secure.SecureFilter.processFilter(SecureFilter.java:294)
        at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108)
        at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163)
        at com.liferay.portal.servlet.filters.i18n.I18nFilter.processFilter(I18nFilter.java:241)
        at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:108)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
        at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:163)
        at com.liferay.portal.servlet.filters.etag.ETagFilter.processFilter(ETagFilter.java:56)
        at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:57)
        at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:206)
        at com.liferay.portal.kernel.servlet.filters.i

Yur*_*nyy 5

好的，所以我没有设法找出为什么CallerService会抛出提到的异常，因为即使在反编译之后paypal_base.jar，代码也非常繁琐，而且很难找出幕后发生的事情。看起来它已经过时了或者什么的，因为除了几个地方之外，我在网上的任何地方都找不到对这个 JAR 的引用。

但我真的建议您坚持使用 PayPal 提供的原始文档。我自己尝试过，这是我发现的：

  1. 按照上述文章中的Paypal API SDK 和下载链接，然后单击类别Merchant下的链接Classic APIs（如果您在网上挖掘，您会发现 PayPal Merchant API 应该用于 ExpressCheckout 请求）。单击Java上面的按钮并使用Maven（首选）或仅使用页面底部的下载链接下载 SDK 。

  2. 将下载的 JAR 添加到您的项目并删除其他 PayPal JAR，因为下载的Merchant APIjar 应包含所有必需的类。

  3. 现在一切都取决于猜测:) 因此，在上面的代码片段中，您已经形成了实例，SetExpressCheckoutRequestType并且您需要some invocation code使用您的实例SetExpressCheckoutRequestType并返回实例SetExpressCheckoutResponseType。

  4. 我使用Search -> References -> WorkspaceEclipse 中的功能来查找jar 中SetExpressCheckoutRequestType使用的位置Merchant API。这个搜索表明（除了其他地方）有一个名为的类SetExpressCheckoutReq有方法setSetExpressCheckoutRequest(SetExpressCheckoutRequestType)

  5. 然后我再次使用搜索功能搜索SetExpressCheckoutReq类的用法，发现有返回需要的PayPalAPIInterfaceServiceService方法的类。setExpressCheckout(SetExpressCheckoutReq setExpressCheckoutReq)SetExpressCheckoutResponseType

  6. 在setExpressCheckout(SetExpressCheckoutReq setExpressCheckoutReq)方法旁边，有一个方法也接受ICredential参数并具有以下签名： setExpressCheckout(SetExpressCheckoutReq setExpressCheckoutReq, ICredential credential)

  7. 再次使用 Eclipse 我寻找实现ICredential接口的类，发现有一个类命名为SignatureCredential带有 3 个参数的构造函数：用户名、密码、签名。这在我看来是要走的路。

    因此，非常近似 - 代码片段现在应该如下所示：

    final SetExpressCheckoutRequestType ppRequest = ...; // here you create your request as in code snippet above

final Properties serviceConfigurationProperties = ...; // bookmark #1
final PayPalAPIInterfaceServiceService service = new PayPalAPIInterfaceServiceService(serviceConfigurationProperties);

final SetExpressCheckoutReq request = new SetExpressCheckoutReq();
request.setSetExpressCheckoutRequest(ppRequest);

final ICredentials credentials = new SignatureCredentials(username, password, signature);
final SetExpressCheckoutResponseType response = service.setExpressCheckout(request, credentials);
    Run Code Online (Sandbox Code Playgroud)

Bookmark #1：一个应该通过Properties服务配置的实例。要找出应该指定哪些属性，应该搜索它并尝试使用原始 PayPal 文档而不是 3rd 方博客 :) 如果查看PayPalAPIInterfaceServiceService类的Javadocs ，他/她会发现有提到的文件“sdk_config.properties ”。在谷歌搜索之后，我找到了该文件的几个示例：Example #1， Example #2

请注意，这不是完整的解决方案 - 它更像是我之前使用 PayPal SOAP API 使用的一组提示。这个 API 经常变化，文档不简洁，所以我真的建议下载Merchant API带有源代码的 jar，每当出现问题时 - 也查看代码 - 这通常会澄清很多。还请坚持使用 PayPal 的原始文档：

  1. 贝宝 SOAP API 基础
  2. GitHub 上的 PayPal 商户 SDK

另外，如果您没有使用 Java 中的 Web 服务客户端的经验，我建议您尝试使用网络上的教程来实现一些简单的客户端 - 这可能会澄清很多。

再次抱歉没有发布完整和简洁的代码片段 - 从现在起我已经 2 年没有与 PayPal 合作过，那时我花了一周的工作时间来找出所有细节并设置和运行。请发布问题 - 我会在有时间的时候尝试回答

希望这可以帮助...

编辑

关于response.getAck()返回FAILURE- 我过去也遇到过这样的问题。我通过试验请求中发送的参数解决了这个问题 -PayPal对这些参数非常敏感，如果任何参数被省略或没有正确的值，只需返回FAILURE.

可以在此处找到完整的参数列表： PayPal SetExpressCheckout SOAP API 文档

另请注意，该版本使用version2.5.106的Merchant SDKAPI 106.0。

希望这可以帮助...

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