PayPal Express Checkout Validating Payment

Question

我们如何使用PayPal Express Check Out中Paypal的响应令牌来验证付款成功/失败。

Answer 1

PayPal responds with a message, such as the one shown below. Note the status, which should include ACK set to Success , and a token that is used in subsequent steps.

TIMESTAMP=2007%2d04%2d05T23%3a23%3a07Z
&CORRELATIONID=63cdac0b67b50

&ACK=Success

&VERSION=XX%2e000000
&BUILD=1%2e0006
&TOKEN=EC%2d1NK66318YB717835M

Source

Answer 2

The DoExpressCheckoutPayment response (if Successful) will include a PAYMENTINFO_n_PAYMENTSTATUS parameter that you can check to see if the payment associated with the API call is actually completed or not.

If this param has a value of "Completed" then you know you're good to go. It could be "Pending", though, in cases where an e-check is used for payment, fraud filters flag the transaction, etc.

Because of this it is recommended that you use Instant Payment Notification (IPN) in order to handle all post-transaction processing tasks like updating your database, sending email notifications, etc.