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External start workflow required the "Request content (parameters)" to be provided in the body of the REST call, capturing the "Request content" into a workflow variable, allows capture of additional data that are not defined as Start Variable(s) of the workflow. This capability supports External Start workflow in Nintex Workflow Cloud to be used as a "Callback URL" end point. This end point with the "Request Content" captured, supports the parsing of returned data and actions to be taken against the returned data.
External Start workflow if capable of capturing Request Content is important as it supports action to be taken on the callback request such as writing the returned value(s) to Sharepoint online list item, etc.
Please feel free to discuss the concept and usage behind.