The sunset of DFA API version v1.18 has been pushed back to April 16th, 2013. This version of the API has been deprecated since November, 2012 and was previously scheduled to be retired on February 28th, 2013.
If you’re still using v1.18, please be sure to update your applications before April 16th. Our release notes will help you identify differences in v1.19, the most important one being the necessity to use HTTPS connections. We are available on our forum to help you with any questions you have.