Your 5 digit PIN number will be used to log in to your account (as an alternative to using your email and password), and to authorise certain actions in the app, such as withdrawals.
In this stage of registration you'll need to set your PIN number, then enter it again to confirm. Please avoid using consecutive or repetitive numbers (e.g. 12345 or 55555).
If you'd like to set up biometric authentication (e.g. Face ID or Touch ID), you'll be able to do so in the app once registration is complete in Settings > Security π