Brainwrap replied to zelf's topic in OtherHi there... I, too, am in the process of upgrading my clients' osCommerce installation from the ViaKlix module to the new Virtual Merchant module. As far as I can tell, I installed and configured everything correctly; my clients' server supports cURL in PHP, and I'm pretty certain that I made all of the code changes correctly in all 3 files. HOWEVER, when I try testing out the actual order process, everything works perfectly well right up until the final screen--where I get a Card Declined error message even when the card info is correct (I've tried it with both the test card info as well as 2 different live credit cards). Any suggestions? It gives the same error with both Visa and MasterCard.