authorize.net

Magento encrypts your authorize.net keys. Here’s how to retrieve them.

In the database, run this query.

select value from core_config_data where path IN ("payment/authorizenet/login", "payment/authorizenet/trans_key");

That should return 2 rows. Copy those rows into the following script and run it.

require_once("app/Mage.php"); //your actual path
Mage::app()->setCurrentStore(1);

$hlp = Mage::helper('core');
//The keys
echo ($hlp->decrypt("FAKEYPiqkMKgprIv8kfp0wqQ==") . "\n");
echo ($hlp->decrypt("FAKEDjCTFxqdkwOYoUyD0OdQ==") . "\n");

Voilà!