I'm trying to configure my payment module with Authorize.net, and I've filled in all the fields with their appropriate, double/triple-checked everything, but when I try to place an order with a REAL credit card, I get taken to the 'checkout_payment.php' page, fill in the details, click Continue, and then Confirm on the next page, and I get sent straight back to the 'checkout_payment.php' page with the message "?error_message=There+has+been+an+error+processing +your+credit+card.+Please+try+again." in the url, but not reflected on the page anywhere.
This is my personal credit card, so I know it's working... I also tried a friend's, it didn't work either. Any ideas what the problem could be?
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