Absolutely!

Change payment method for your private account via the app

1. Click on More in the menu
2. Click on 'My Pages' and select your desired payment method under 'Payment Method'
3. Your payment method is now saved
   
   

Change payment method for At work via the app

1. Click on More in the menu
2. Click on 'At work' under Account
3. Click on 'Change payment method' and select a new payment method