【发布时间】：2017-08-20 04:54:58
【问题描述】：
我正在尝试在我的 Android 应用程序中使用PayPal 付款，到目前为止，我已经设法在instructions here 之后在onActivityResult 中获得 PayPal 的回复。现在我需要验证交易，这就是我的位置失败。这是我到目前为止所做的，
private void verifyPayment(String paymentKey){
try {
APIContext apiContext = new APIContext("my_access_token", "my_secret_token", "sandbox");
Payment payment = Payment.get(apiContext, paymentKey);
} catch (PayPalRESTException e) {e.printStackTrace();}
}
这是错误日志，
response-code: 500 details: null
at com.paypal.base.rest.PayPalResource.execute(PayPalResource.java:431)
at com.paypal.base.rest.PayPalResource.configureAndExecute(PayPalResource.java:295)
at com.paypal.base.rest.PayPalResource.configureAndExecute(PayPalResource.java:228)
at com.paypal.api.payments.Payment.get(Payment.java:187)
at com.mob.tr.Names.verifyPayment(Names.java:175)
at com.mob.tr.Names.access$000(Names.java:39)
at com.mob.tr.Names$1.run(Names.java:128)
at java.lang.Thread.run(Thread.java:833)
Caused by: com.paypal.base.exception.HttpErrorException: Response code: 500 Error response: <ns1:XMLFault xmlns:ns1="http://cxf.apache.org/bindings/xformat"><ns1:faultstring xmlns:ns1="http://cxf.apache.org/bindings/xformat">java.lang.NullPointerException</ns1:faultstring></ns1:XMLFault>
at com.paypal.base.HttpConnection.executeWithStream(HttpConnection.java:162)
at com.paypal.base.HttpConnection.execute(HttpConnection.java:65)
at com.paypal.base.rest.PayPalResource.execute(PayPalResource.java:417)
java.io.FileNotFoundException: https://api.sandbox.paypal.com/v1/payments/payment/PAY-60892637K9684232WLDMQQYA
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:238)
at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.getInputStream(DelegatingHttpsURLConnection.java:210)
at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:25)
at com.paypal.base.HttpConnection.executeWithStream(HttpConnection.java:132)
【问题讨论】：