Paypal 如何在退款电话中使用贝宝认证标志和时间戳

我需要代表第三方向客户退款。我研究了权限API如何获取访问令牌和验证代码，以便在身份验证API中使用它来生成签名和时间戳。但在这之后，我仍然对如何在退款API中使用它感到困惑。目前这是我的退款贝宝代码

CallerServices caller = new CallerServices();
APIProfile profile = ProfileFactory.createSignatureAPIProfile();
if(Configuration.getProperty("PaypalEnvironment").equals("sandbox"))
{
profile.setAPIUsername(Configuration.getProperty("PaypalAPIUsername"));
profile.setAPIPassword(Configuration.getProperty("PaypalAPIPassword"));
profile.setSignature(Configuration.getProperty("PaypalSignature"));
profile.setEnvironment(Configuration.getProperty("PaypalEnvironment"));
caller.setAPIProfile(profile);
}
RefundTransactionRequestType pprequest = new RefundTransactionRequestType();
if ((amount != null && amount.length() > 0)
        && (refundType.equals("Partial"))) {
    BasicAmountType amtType = new BasicAmountType();
    amtType.set_value(amount);
    amtType.setCurrencyID(CurrencyCodeType.fromString(currencyCode));
    pprequest.setAmount(amtType);
}
pprequest.setVersion("63.0");
pprequest.setTransactionID(transactionId);
pprequest.setMemo(note);
pprequest.setRefundType(RefundType.fromString(refundType));
RefundTransactionResponseType ppresponse = (RefundTransactionResponseType) caller
            .call("RefundTransaction", pprequest);

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在这段代码中，我如何嵌入签名？

退款很简单。一旦你得到了请求令牌和验证码，这就是它。您不需要将此传递给退款API。您只需在上面添加这一行即可

            profile.setSubject(emailid);

然后就可以退款了