I have the same issue with a "buy now" button, but not sure how the solution suggested in mgfranz message was applied to solve the problem. When I try this, I am no longer on the right page to make the transaction. I've tried changing the url in the html code and then the button in no works and I get an error message ("PayPal cannot process this transaction because of a problem with the seller's website. Please contact the seller directly to resolve this problem.")
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