The Klarna-api-bundle PHP SDK by asgoodasnu is an SDK that integrates and wraps the Klarna API into a symfony2 bundle. The Klarna API allows developers to integrate Klarna's functionality with other applications. Some example API methods include emailing invoices, crediting invoices, calculating costs, and managing inventories.
In May, TradeKing announced major enhancements to its open API. Now, TradeKing wants to see the API's functionality shine in creative new apps; TradeKing recently announced the TradeKing Financial Entrepreneur Pitch-Fest Competition.
Citi has announced the launch of a global Developer Hub and APIs that provide access to a number of Citi platform capabilities including account management, peer to peer payments, and money transfer to institutions. Services are currently available in Singapore, Australia, and the United States.