VDSmanager have no this feature. You can put links to management panels (VDSmanager) to your billing system/customer zone.
For example, our product BILLmanager have button in the customer zone "Server information (control panel links)" where user can go to VDSmanager by link for example
https://node-address/manager/vdsmgr?...132.132.12.112 and ISPmanager by link
https://132.132.12.112/manager/ispmgr
Server node information in billing always is actual, because billing system use node for start/stop VPSes / change tarif plans / get information (traffic).