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Code sampleMSDN
2012
SharePoint 2013 Workflow: Call an External Web Service
The MSDN Code Gallery closed and took the downloadable sample with it.
Overview
The sample workflow is bound to a list named Customers. After the user enters a value for CustomerID, they can manually run the workflow. The workflow uses the CustomerID to search for the customer using the public Northwind sample OData service (http://services.odata.org/Northwind/Northwind.svc/).
When it finds the customer, it adds the details it retrieves from the service to the list item and then concludes.
MSDN Archived
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