Install dotnet-svcutil (https://docs.microsoft.com/en-us/dotnet/core/additional-tools/dotnet-svcutil-guide)
run dotnet svcutil https://www-lc3cst.myappro.com/ACS/ConnectorService.svc -n "*,CRIF.ACTion"
move Reference.cs into desired directory structure

This process can also be accomplished within Visual Studio directly: https://docs.microsoft.com/en-us/visualstudio/data-tools/how-to-add-update-or-remove-a-wcf-data-service-reference

Note that the generated Service Model Binding will reject HTTPS URLs due to the use of BasicHttpBinding, which results from the WSDL's listed (but unusable) HTTP endpoints. A BasicHttpsBinding object should be used instead.