Except that mine are dynamic pricing buttons.
If the customer buys 2 DVDs, or 3, or 4... the price depends on Qty and shipping, and currency
Paxum has a sample code for PNB, but then there's another page about hash() code you're supposed to include for security, but the sample PNB code doesn't include that in a placeholder. And unlike traditional PHP documentation, the command format isn't followed by a real world punctuated example.
CCBill does hash(), and that's well documented, in very understandable English, and quite easy to generate on the fly.
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