The plugin validates customer's addresses using USPS, UPS or Google Address Validation API.
The plugin has several modes:
 - enable Address Validation for checkout page (stop checkout). The customer sees the warning message during checkout and he has to fix it at once.
 - enable Address Validation for checkout page (info message). The customer see the warning message during checkout on shipping method list checkout step, but  and he can ignore it.
- enable Address Validation for customer account page.
- enable Address Validation for nopcommerce admin mode. The store's owner has to provide the valid address.

The plugin adds the button "Validate address" on the order details page (nop admin mode).  The store's owner can check shipping address manually.

The plugin works only with the native nopcommerce checkout (onepage or multipages).
The plugin doesn't work with external Onepage Checkout plugins from external developers.

Compatible for NopCommerce 4.60, 4.50, 4.40.

How to Install and Configure plugin.