To link your Nationwide bank account to Plum you need:
1. Customer Number
This is your 10-digit number which you use to log in to Nationwide internet banking.
2. Memorable data
You can log in to your internet banking either using your card reader or your memorable data. To link your Plum account you need to enter one of the three items of the memorable date, place or name you have set up.
This is a 6-digit number you set up along with memorable data to use internet banking.