Web Service API
Web Service APIs use an XML-based extensible message envelope format called Simple Object Access Protocol (SOAP) to transmit data over HTTP and HTTPS. The definition of the Web Services API is available in a Web Service Description Language (WSDL) file.
Web Service API, also referred to as SOAP API, is available in limited release, which means that customers must specifically request to use it and be approved by ExactTarget. Nevertheless, the ExactTarget Web Service API is an anchor feature of the product and considered a core part of our offering. The ExactTarget Web Services are flexible and can be used with most of the popular programming languages, such as asp.net, PHP, ColdFusion, Java, and C#.
The Web Service API provides robust security over the XML API and a standardized approach that is easy to learn for people who are already familiar with Web Service. It offers fast performance and a great deal of flexibility for diverse business needs. However, the Web Services API is more difficult to get started with a higher learning curve for those who were not already familiar with Web Service.