I'm building a site for a client and while checking their zip code before adding items to their cart is no issue, I'm worried about the potential for customers to enter a different zip for shipping at checkout.
Is anyone aware of any solutions to ensure the zip code provided at checkout for delivery meets a specific criteria — for example it is included within a list of pre-defined zip codes.
Please check under settings of shiopping and delivery. There is option for local delivery and restricting by zip code or by distance. If that doesn't serve the purpose look for apps in Shopify app store