How do I login to Westpac One online banking?

As soon as you're registered you can start using Westpac One® online banking:

• If you're on a computer, visit www.westpac.co.nz and click 'Login' in the top right hand corner of the web page 
• If you're on a smartphone or tablet, download the Westpac One online banking app for free: 
  • From an iPhone or iPad, visit the App Store 
  • From an Android phone or tablet, visit Google Play. 
• Once here, simply enter your Customer ID number and password
• To log out of the App, open the bottom right "Menu" and then select 'Log out'.