Systems and methods are disclosed for integrating with third-party applications. An extension module operates with a user interface application on a client computing device. The extension module enables integration of functionality of an associated middleware system. The extension module extracts data from a user interface of a third-party application system based on a regular expression template. The extension module transmits data to the middleware system and receives information from the middleware system. The extension module can alter at least a portion of the user interface based on the information received from the middleware system.