PayPal Express Checkout - 2012 Guide de l'utilisateur télécharger pdf (Page 25)

Express Checkout Integration Guide August 7, 2012 25

Getting Started With Express Checkout

Troubleshooting Your Express Checkout Integration

7. Review the response string from the DoExpressCheckoutPayment API operation.

If the operation was successful, the response should include ACK set to Success, as

follows:

TIMESTAMP=2007%2d04%2d05T23%3a30%3a16Z

&CORRELATIONID=333fb808bb23

ACK=Success

&VERSION=XX%2e000000

&BUILD=1%2e0006

&TOKEN=EC%2d1NK66318YB717835M

&PAYMENTREQUEST_0_TRANSACTIONID=043144440L487742J

&PAYMENTREQUEST_0_TRANSACTIONTYPE=expresscheckout

&PAYMENTREQUEST_0_PAYMENTTYPE=instant

&PAYMENTREQUEST_0_ORDERTIME=2007%2d04%2d05T23%3a30%3a14Z

&PAYMENTREQUEST_0_AMT=19%2e95

&PAYMENTREQUEST_0_CURRENCYCODE=USD

&PAYMENTREQUEST_0_TAXAMT=0%2e00

&PAYMENTREQUEST_0_PAYMENTSTATUS=Pending

&PAYMENTREQUEST_0_PENDINGREASON=authorization

&PAYMENTREQUEST_0_REASONCODE=None

Security Issues

You must always be concerned with protecting sensitive data. This not only includes your API

credentials, but also any data exposed in a client’s browser, such as data about the transaction

stored in cookies.

 In the simplest examples, such as the ones provided by PayPal to demonstrate Express

Checkout usage, the API credentials may be exposed. Thus, if you copy code from

examples or SDKs, you should always review your website for security issues and correct

them before you go live with your website.

 Encrypt all saved information related to the PayPal transaction. For example, if you keep

order status information in a cookie, make sure the information is encrypted.

 Use a secure transmission protocol, such as HTTPS to transfer information between your

site and PayPal. Do not use HTTP or insecure cURL.

Troubleshooting Your Express Checkout Integration

If you have trouble with your integration, there are several things you can check first. If you

try them yet continue to have problems, you can also contact Merchant Technical Support

(MTS).

If you cannot resolve the issue yourself, you will need to gather some basic information before

contacting MTS, including a log of the actions that led to the error. You can contact MTS at

https://www.paypal.com/mts.

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PayPal Express Checkout - 2012 Guide de l'utilisateur Page 25