Hi,
Just a remark: .NET CORE is different than .NET, WorkflowGen doesn’t use .NET CORE at all.
You can always use the SOAP API to use WorkflowGen as a connected service:
http://docs.workflowgen.com/v78/api/html/9b0acccb-cdc1-35b3-2f6c-5c9aadbadaf1.htm
Here is also a post to know how to reference the API in your VS2017 solution:
Best Regards,
Eddy.