Is there support for SHA-512 on the Authorize.NET extension on Magento 1.9? The transactions appear to be using md5 by default. Thanks
Authorize.Net phases out MD5 based hashes used for transaction response verification. Phase 1 means that merchants are no longer able to configure or update their MD5 Hash settings in the Merchant Interface. This will have severe impacts on merchants who use or are interested in using the Authorize.Net Direct Post method in Magento. So if you are not using Authorize.Net Direct Post method in magento you don't have to worry.
