Thanks for the guide Mr. -T,
However I'm not sure I'm setting up the return URL correctly.
According to the PayPal site, I must include text on the page linked to the URL along the lines of:
"Thank you for your payment. Your transaction has been completed, and a receipt for your purchase has been emailed to you. You may log into your account at www.paypal.com/us to view details of this transaction."
My question is, if I insert this text into the checkout_process.php page, will this text show only when a paying customer is returned to this page from PayPal? Or will this text be there regardless of whether a customer has just ordered from PayPal or not?
Sorry if my question shows a basic misunderstanding - I'm new to PHP.
Thanks.