The Basecamp PHP SDK by Netvlies Internetdiensten allows developers to integrate the Basecamp API into their PHP applications. This SDK is still under development, and not all methods have been implemented yet.
Payment for services rendered has always been a quixotic journey for small to midsize businesses (SMBs). You would think the companies that deliver IT services to SMBs would have figured out how to automate the payment process long ago, but in reality, integrating the QuickBooks financial software that small companies rely on with the professional services management software that IT services use to manage projects and track billing is a significant challenge.
There is the old hat of publishing giants struggling to find viable business models in the digital world. Then there are countries and legislations that are even trying to turn the very principles of the internet upside down, by making the creation of links an act that one should pay for. On the other end of the spectrum there are newspapers that have public APIs to their content. These newspapers are striving for innovation, by exploring new grounds, instead of sticking to what they know.