Judo Payments offers a platform to build complete mobile payment solutions and host applications with a Judo marketplace. The Judo Payments Ruby SDK assists in embedding Judo Payments functionalities into Ruby applications. The API and SDK methods, classes, and functionalities are fully documented on Judo's site. The SDK is compatible Ruby 1.9.3 or later (up to version 2.1.x) and requires a developer API key for use.
Google recently announced a beta version of its new App Engine firewall. In addition to the security features inherent within App Engine, the App Engine firewall allows developers to block and permit users based on IP address and geography. Developers simply create rules and prioritize the rules.