Changes to Authorize.Net

"As you may be aware, an Internet-wide security issue, commonly referred to as POODLE, has been identified in the last two weeks and affects anyone using older Web browsers that use SSL version 3 (SSLv3), specifically Internet Explorer (IE) 6...
To that end, on November 4, 2014, we will be disabling the use of SSLv3 within our systems. This means that if your website or shopping cart solution uses SSLv3 to send transactions to Authorize.Net, you will no longer be able to process transactions."