Magento Commerce, 1.14.x

Magento 1.x Software Support Notice
For Magento Commerce 1, Magento is providing software support through June 2020. Depending on your Magento Commerce 1 version, software support may include both quality fixes and security patches. Please review our Magento Software Lifecycle Policy to see how your version of Magento Commerce 1 is supported.

Authorize.Net Direct Post

Magento incorporates the Direct Post method for payments made through Authorize.Net. When payments are made using the Direct Post Method, the Authorize.Net gateway handles all steps in the transaction process, such as payment data collection, data submission, and response to the customer, while the customer remains in your store.

Deprecation Notice: Authorize.Net has deprecated the use of MD5 Hash. When configuring, enter a Signature Key using SHA-512. These instructions include the updated step. Payment processing will not complete until you add the correct Signature Key. For details, see Authorize.Net's MD5 Hash End of Life & Signature Key Replacement and What is a Signature Key.To install the patch, see the Magento KB article Update Authorize.Net Direct Post from MD5 to SHA-512.

Checkout Using Authorize.Net Direct Post