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The e-commerce.

Coupon Miscalculation


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I webmaster for a company with a modified osCommerce store running Coupons & Gift Vouchers (not CCGV(trad) unfortunately, and I'm afraid of upgrading when it involves so much hacking of files).


We use Authorize.net AIM for payment.


We've created a 20% off "thank you" coupon for current users. The coupon works fine when only one product is being purchased but it gets miscalculated when more than one is in the cart. I've been googling and searching here for answers and my feeling is this has to do with the Authorize payment module, but I haven't found an actual solution to the problem.


Any ideas?

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