錯誤：81115，缺少參數需要執行付款操作？

Question

我在執行Doexpresscheckout方法時，不斷收到錯誤：81115，缺少參數要求的付款操作？ 要寄給以下參數

&METHOD=DoExpressCheckoutPayment
&VERSION=65.1
&PWD=1299156195
&USER=123hel_1299156185_biz_api1.gmail.com
&SIGNATURE=Ai1PaghZh5FmBLCDCTQpwG8jB264Ay4Ll3wOTnzcWtuD-HdE5qiI1p.N+
&TOKEN=EC-6M866117WG376591R
&PAYERID=RDX5GUURFJ9VY
&PAYMENTACTION=%27.Sale
&AMT=104
&CURRENCYCODE=%27USD.%27,

幫助我修復此錯誤？

Answer 1

好吧，一個小的搜索就使我找到了2種可能的解決方案：

https://www.x.com/message/157458

http://randomerror.wordpress.com/2010/01/27/error-code-81115-on-paypal-express-checkout-code/

最后一個似乎在Paypal的PHP應用程序中很常見：

paypalfunctions.php代碼上的錯誤

$token = urlencode($_SESSION['token']);
$paymentType = urlencode($_SESSION['paymentType']);

應該：

$token = urlencode($_SESSION['TOKEN']);
$paymentType = urlencode($_SESSION['PaymentType']);

Answer 2

PaymentActionSpecified=true

此字段應設置為...