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Posted by Andy Pieters on 10/18/58 11:16
Hi Robert
I am just in implementing PayPal as one of the Payment providers on an order.
I realize the PayPal documention is a bit too exhausive and is easy to lose
track of what is important.
I will introduce two items to you:
IPN (Instant Payment Notification)
You should have a script that handles callbacks from PayPal. The PayPal
system itself calls the script whenever something important happened. The
security is that you get all the data PayPal sent, send it back to a POST and
retrieve the reply "VERIFIED" or "FAILED". This script should create the
keys and send emails to the customer with these keys.
PDT (Payment Data Transfer)
PDT is used by PayPal when the payment is completed and the PayPal system
forwards the user back to your page. Use the PDT to look up in your database
if you already received an IPN from PayPal regarding this order.
PayPal alows you to check your system by the use of a Sandbox. They also have
a forum where you can ask specific questions.
With kind regards
Andy Pieters
Straight-A-Software
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