RE: Shopping Basket not cleared after successful order
Knowledgebase article [#19] Paypal Web Site Payments Standard - setup.
Problem with Checkout Process
PayPal Callback Errors
PayPal integration instructions need updating, desperately!
Paypal Gateway Variables (Checkout)
RE: Error on payment screens in back end
Paypal error if process currency field is left blank
RE: How to set up with Paypal
RE: Paypal IPN notification urls