Google maps directions API with over 25 waypoints

Hi, I need route optimization for a given list of postal addresses using google maps directions API. In my database, I have a list of addresses and if needed I can convert them to lat and long as well. with each request, I will be passing between 5 and 200 addresses. and the returned list should be optimized with a starting location and end location for the driving mode. Google API has a limit of 25 ways points I believe, but I need the optimisation to work for up to 200 waypoints. and this needs to be done in PHP. Please get back to me if you have any other questions.