You'll need to complete, print and send the relevant letter(s). Here are the templates to download:
Payment from a bank account (direct debit)
Payment to a bank account (direct credit)
Payment from a credit card (direct debit)
You may also be able to contact your service provider online or by phone to update your card details
Salary (incoming payment)
Share dividends (incoming payment)
Alternatively you can complete the Notice of Variation of account form and return it to a CommBank branch so we can help you switch.