The Stripe .NET Library by ServiceStack is a project that contains a Portable Class Library with a typed .NET client gateway for accessing Stripe's REST API. Used by servicestack.net to process merhcant payments and recurring subcriptions online. Features include: Small, typed, message-based API with DTO's and fits in a StripeGateway.cs; portable profile available supporting .NET 4.5, Xamarin.iOS, Xamarin.Android and Windows Store clients; custom declarative DTO's defined within the app to access new APIs, and aims to implement the mockable IRestGateway, which allows developers to return test data with a generic MockRestGateway.
The initial releases from credit card provider MasterCard look to be more than a toe-dip into APIs. With its MasterCard Payments API and two others, the company could be diving straight into the deep end. Though the services are still in beta, MasterCard appears to be taking very seriously its creation of a developer ecosystem.