Ian Grieve is Hands On With Microsoft Dynamics GP 2015 RTM: Web Services Service Verification
Hands On With Microsoft Dynamics GP 2015 RTM: Web Services Service Verification | azurecurve
Development & IntegrationMicrosoft & the GP EcosystemGP 2015
Archived post from 2014. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.