Archipad Web
To modify your banking details:
Click on your user ID in the top right corner,
Select Manage your subscriptions,
Click on the Subscription tab.
a. If your Premium subscription is active
Click on the Modify payment method button,
Enter your banking details,
Click on Update.
b. If your subscription was purchased through the App Store
Banking details can be changed from your iPad.
Select the App Store application
Tap the icon of your user ID in the top right corner,
Select your App Store account line,
Tap Manage Payments,
Add or modify your banking details,
Tap the Completed button.