In the Billing info section of the My account page, click Update billing details. You'll be redirected to my.MYOB, where you'll complete the process.
Enter your MYOB Account details and log into my.MYOB (if you're already logged in, you won't see this window). For more information about MYOB Accounts and my.MYOB, see About MYOB Accounts and my.MYOB.
Once you're logged into my.MYOB, you'll see the Manage Payment Profiles page. Follow the prompts to manage your billing information.
Yes, sensitive customer data (such as credit cards) is encrypted in accordance with Payment Card Industry Data Security Standard (PCI DSS) 1.2 standards. The transmission of cardholder data across open, public networks is also encrypted.