Unless one of the debug options other than OFF are selected in PayPal Website Payments Pro, the $messageStack will not be outputted as described here:
http://www.zen-cart.com/showthread.p...53#post1140253
I haven't verified if this is also the case with PayPal Express Checkout and Website Payments Standard, but you may want to check your code there as well.
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24 Jul 2012, 09:36 PM #1
Totally Zenned
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[Fixed v1.5.1] PayPal WPP Processor Decline Fails to Show Error Message
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