In your MegaPay Mobile App, on the Settings screen, you can choose the "Scan" option. When selected, you will have to point the camera on the phone at the QR code to scan the code, which will apply your Login and Password credentials without having to type them.
When you are in the Payslip/P60 screen when you pull down on the page to refresh, any new or updated Payslips/P60s will be download to your MegaPay Mobile App.
To set a PIN which will lock the App when you lock your phone or switch to another App
To turn the PIN off, unset the "Use PIN code" option -- you will have to input your PIN to disable the function.
If you forget your PIN, the only way to reset is to delete and re-install the app. There is no way to recover the PIN.
MegaPay Mobile is available in the iTunes App Store and via Google Play. Search for MegaPay Mobile in your app store.