You are not able to install this in a standard Shopify development store, only a Shopify Plus sandbox with checkout extensibility enabled.
No. This app is only available to those stores that are upgraded to Checkout Extensibility which is currently only available to stores on the Shopify Plus plan.
No. This app does not utilize the checkout.liquid file and is installed seamlessly directly from the app store. The checkout.liquid code approach is now deprecated. Shopify provide more information on this and how to upgrade to Checkout Extensibility.
Address formats from postal authorities around the world can differ considerably and Experian Address Validation will provide the best possible response and format for any given country.
By default, to ensure consistency, our integration will populate only the first Address field. However, if the checkout form options have been configured to include the Address line 2 (apartment, unit, etc.) field, our app offers a configuration option to control how the address is distributed across both address lines. The app configuration page explains the options available.
Within the Shopify checkout, some countries trigger a selector for the State/Province/Region field. When not using our integration, this allows users to manually select their state/province/region from a list.
With our validation enabled, this field will be automatically populated for your customers where the data is available. Our integration will leave the field blank if the data is missing.
For some countries, we currently have no state/province/region data at all:
For those countries, a customer will be able to manually select this field.
