I am trying to create a custom paypal button for selling digital goods, that will direct the buyer to a link that will allow him to download the file.
I've read a bit this paypal article about advanced html variables but I am not sure which I have to use to make it work: https://developer.paypal.com/webapps/developer/docs/classic/paypal-payments-standard/integration-guide/Appx_websitestandard_htmlvariables/
Obviously the download should only initiate based on the payment ID to prevent free downloads, or is that done automatically by paypal?

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