Here's my original thread:
http://www.zen-cart.com/forum/showth...371#post339371
To sum it up, if my payment balance after applying a gift certificate is equal to or less than the amount of tax imposed on shipping charges, then the Paypal payment doesn't process at all. This happens on 1.3.7 fresh install, and 1.3.6 upgraded to 1.3.7.
Example:
Purchase price of 2 items: $14.00
Shipping: $3.50
Total Tax: $1.18
Gift Cert: -$18.44
Balance: $0.24
Payment: in black hole
Tax calculated on shipping charge alone (3.50*.0675)=$0.24
So if I apply GV worth $18.43 so that my balance is $0.25, the payment is OK.
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