APIs, or Application Programming Interfaces, are the connecting tissue between different systems or layers of an application. Applications often have three layers: a data layer, a service (API) layer, and a presentation (UI) layer. The API layer contains the business logic of an application - the rules of how users can interact with services, data, or functions of the app. Because the API or service layer directly touches both the data layer and the presentation layer, it presents the sweet spot of continous testing for QA and Development teams.
Organizations have adopted modern architecture involving Cloud services and Mobile, and the result we see is a large composite system that sits behind these simple-looking applications. The content of the message layer and business logic is very critical to the successful operation of these applications. With the architecture following certain protocols, such as XML, SOAP, REST and others, the big question becomes – how to validate our Business Applications.
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