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SharePoint Designer 2013 workflow action “Call HTTP Web Service”
Part 1
In this first section we will start creating our SharePoint Designer 2013 workflow. Our focus here is the “Call HTTP Web Service” action. We will be using and Ebay web service for this example. The response from the web service is in JSON (See image below). The “Call HTTP Web Service” workflow action would be useless without the new “Dictionary” workflow action.
Part 2:
In this section we will be taking the workflow a bit further.
1. We will extract the “Title” and “DealURL” data from the JSON response.
2. We will then create and entry in the WebServiceList for each node in our JSON response ( 7 in total )
Reference:
Categories: SharePoint
Call HTTP Web Service, SharePoint Designer 2013, Workflow
SharePoint (and Project Server) Shenanigans 
If you use the activity to do a call back to the SharePoint REST API be aware to set the ACCEPT header correctly: http://www.fiechter.eu/blog/Lists/Posts/Post.aspx?ID=35&mobile=0
To use the text of a managed metadata field in your workflow you can use the Call HTTP Web Service action with the following approach: http://www.fiechter.eu/blog/Lists/Posts/Post.aspx?ID=37&mobile=0