I have Magento ver. 220.127.116.11 and am in GA. I’m having issues when a customer places an order and they are shipping to GA. During checkout using Authorize.net, they get the error: “GATEWAY ERROR: The tax amount is invalid.”.
Currently, my tax rate is: United States, Georgia, *, 7.0000
I’ve noticed that the customer\’s total is always more than 4 decimal places as well, for example: Total:
This error only happens when the customer checks out using Authorize.net. There are no errors when using PayPal Express Checkout.
I’ve called Authorize.net and they cannot help as the transaction doesn’t even “reach” their end for them to diagnose the issue and they said it is more than likely something wrong with Magento. This error started Oct. 1, 2011 but before then, we had no issues with GA customers.
Please help me! I greatly appreciate your help in advance.