如果给定数据中出现任何错误，paypal api将返回400-错误的请求错误.

If anything goes wrong in the data given, paypal api will return a 400 - Bad request error.

当我收到错误(PHP SDK)时，我捕获了异常，并且$ex->getData()返回了一个json，其中包含有关错误请求的详细信息，在我的情况下，我给出的货币代码是错误的.

When I got the error(PHP SDK), I caught the exception and $ex->getData() returned a json which contains the details about the bad request, in my case the currency code I given was wrong.

    try {
        $payment->create($apiContext);
    } catch (PayPal\Exception\PPConnectionException $ex) {
        var_dump(json_decode($ex->getData()));
        exit(1);
    }