In my previous post on the different ways to determine the return message from a REST API call in a SPD workflow I covered using a test list and Fiddler to build your web call in a SharePoint Designer workflow.  In this post I want to discuss manipulating REST API calls in SharePoint Designer 2013 workflows.  Basically I want to show how you can determine what your read string is going to look like based on the values coming back from SharePoint.

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