In a previous post I tried to give an introduction on how to get started with PayPal Payment Data Transfers (PDT). PDT is very handy in several cases, but you can\'t always rely on it since it requires the user to return to your page after doing the payment. That will often happen, but it\'s not guaranteed to happen. If you for example want to mark an order in your system as paid or something like that, you most likely want to use PayPal Instant Payment Notifications (IPN) in addition to PDT. In
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