The Checkout.com Get Payment Details CSharp Sample Code demonstrates how to return the details of the payment with the specified identifier string. Response headers include the unique identifier of the request and the version of the API.
Dwolla is an extremely innovative Payment API and the site allows you to transfer money with one of the least payment charges. We have covered Dwolla before here. Here is an interview with Michael Schonfeld, Developer Evangelist of Dwolla API.
Visa has opened the submission process for the next edition of The Everywhere Initiative. The next phase is open to startups in Australia and New Zealand that will respond to one of three challenges that use Visa APIs to improve commerce experiences. Visa will accept responses through August 26th.