Simplify your checkout process by having your customer validate or lookup their address during checkout. Save Time & Money Using Address Validation. If your store has tried to ship to an invalid address, you know it has cost you both the time and money to resend the order to the customer. Never worry about this hassle again! Easily add US Address Validation, UK Postcode Lookup, or NL Postcode Lookup to your WooCommerce Checkout. Postcode/Address Validation will simplify your checkout process and improve order address quality by having your customer validate or lookup their address during checkout. Improve your bottom line and customer happiness with Address Validation!