The CityGrid Ruby SDK by CityGrid provides installation, configuration, and sessions as part of the resources included on GitHub. Although still in development, author recommends to use the latest development. To start, obtain a publisher code at http://developer.citygridmedia.com/
Ever tried to sell something on the Internet and hoped that the process was simpler than what it currently is? What if selling an item on the Internet was as simple as sharing the item for sale with your friends on the social web? Gumroad, a San Francisco based startup has adopted that philosophy and wants to take the pain out of selling an item on the web and it also provides the Gumroad API for its core features.