Configuring mandatory authentication: The "force users" property can be changed in the grid application.
Managing the web services: The web services are described by the WSDL files published in the grid environment. You reach those from the Grid manager console under the http entry of the Default Router in any of the grid instances. The name of the Context Root is "M3WorkFlowEx".
Error handling: In runtime, any errors and warnings are returned in the FAIL variable, and further detailed in the job log of M3WF.