Isn't this question the same as DIGITAL GOODS...Buy Now Button?? See this pdf's page 275 for "Offering Product Options With Add to Cart Buttons".
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I've a similar question about digital delivery: how do I redirect the user to their purchased digital deliverables, assuming there're more than 1 in their order? PDT (Payment Data Transfer) doesn't return item_id's when provided with a transaction_id.
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