ZipTip puts a postal-code checker on your product and cart pages so out-of-zone customers find out before they reach checkout — no more refunding orders you can't fulfil. Define delivery zones with prefixes, ETA, surcharge, cutoff times, and blackout dates manually or via CSV (up to 10K rows). Capture out-of-zone emails as a waitlist; optionally tag them as Shopify Customers for your email tools. Works with any country's postal code format and runs fully client-side, so it doesn't slow down your