Is the most current documentation for the template customization at https://pubs.vmware.com/vsphere-50/index.jsp?topic=%2Fcom.vmware.wssdk.apiref.doc_50%2Fvim.vm.custom... ?
When browsing the site for vpshere 6.5, I can only find the newer REST based docs for similar functionality.
vSphere Web Services API Reference is accessble at https://code.vmware.com/doc/preview?id=4206
vSphere Web Services API Reference is accessble at https://code.vmware.com/doc/preview?id=4206