SharePoint 2013 Web Services
SharePoint 2013 makes it easier to design custom web services or consume existing web services.
There are many instances when you will need to create a custom web service that will be consumed by other SharePoint lists or external applications. In additional, there may be a need to leverage an existing RESTful web service to consume application data into your SharePoint list. With SharePoint 2013, we now have the capability of creating and consuming web services dynamically.
“In SharePoint workflows, you call a web service using a new action introduced in SharePoint named Call HTTP Web Service. This action is flexible and allow you to make simple calls to a web service easily, or, if needed, you can create more complex calls using HTTP verbs as well as allowing you to add HTTP headers. Figure 1 shows you the Call HTTP Web Service action on the SharePoint Designer 2013 surface.”