The GigSpace Artist app can be locked behind your phone's own Face ID, Touch ID or passcode. Turn it on in Settings under Screen lock.
It's worth doing if your earnings and payout details are on a phone you occasionally hand to someone.
This uses your phone's own security. GigSpace never sees your fingerprint, face or passcode; the phone simply tells the app yes or no. Nothing biometric is sent anywhere or stored by us.
If you turn it on and later can't get past it, signing out and back in resets it.