DeliverSure

DeliverSure checks shipping addresses at checkout, before the order is placed. When a customer enters an address, the app verifies it against Google's Address Validation service to see whether it resolves to a real, deliverable location. If it does not, the customer sees a message asking them to check the details, either as a warning they can dismiss or as a block that prevents them from continuing, depending on how you have configured it. Incorrect addresses can lead to failed deliveries, return charges and support tickets. Raising the question while the customer is still on the page gives them an opportunity to correct the details themselves. You can also limit which countries you deliver to. Addresses outside your list are stopped with a message naming the country, which gives the customer a clearer reason than a generic error would. The app stays quiet while a customer is still filling in the form, and if the validation service is unreachable, checkout is allowed to continue. A dashboard page lets you switch between warning and blocking, choose the countries you serve, and edit the wording customers see. The free plan covers 10 validated checkouts a month.