How to manually stop and start PanGPS (service) or GlobalProtect (i.e. PanGPA) on macOS?

In case the PanGPS and GlobalProtect (i.e. PanGPA) processes require to be stopped and started manually, the launchctl command on macOS can be used:

Stop PanGPS
launchctl unload /Library/LaunchAgents/com.paloaltonetworks.gp.pangps.plist

Stop GlobalProtect (i.e. PanGPA)
launchctl unload /Library/LaunchAgents/com.paloaltonetworks.gp.pangpa.plist

Start PanGPS
launchctl load /Library/LaunchAgents/com.paloaltonetworks.gp.pangps.plist

Start GlobalProtect (i.e. PanGPA)
launchctl load /Library/LaunchAgents/com.paloaltonetworks.gp.pangpa.plist

To check if both PanGPS and PanGPA are running (both processes should have a PID): 
launchctl list | grep -i palo