Install Address Ninja, choose a plan, and activate the validation checks you need.
Visit the Address Ninja listing and click Install.
Open Apps > Address Ninja in Shopify admin.
Choose a plan on Shopify’s plan selection page if prompted, then complete the confirmation and return to the app.
On the home page, open a validation check. Complete its required fields and customize the checkout error message if needed.
Click Activate, then Save.
Test checkout with an address that should fail the enabled check. Confirm that the error appears.
Starter includes house numbers, apartment or suite numbers, PO boxes, special characters, MeinEinkauf.ch, and ZIP/postal code checks. Growth adds DHL checks. Pro adds maximum character counts and custom regex rules.
Eligible development stores receive Developer access to all checks without choosing a paid plan. Existing paid subscriptions continue when the app updates.
Contact support if a check does not behave as expected.