King Checkout Validation

The app itself is feature-rich and has been very helpful for managing shipping restrictions and preventing problematic orders. It's easy to use, flexible, and backed by a team that truly cares about its users.

Wir brauchten eine Sperre für Schweizer Rechnungsadressen, die nur bei rein digitalen Bestellungen greift. Die Bedingung dafür gab es noch nicht, also haben wir den Support gefragt: Antwort nach 30 Minuten, das fertige Feature noch am selben Tag released. Die Regel läuft exakt wie gewünscht, getestet mit Karte und PayPal. Besserer Support ist kaum möglich. Klare Empfehlung.

Exactly what we we're looking for, since we can't use the checkout blocks as we're not on Shopify Plus.

Great support and service. Gordon is a major help!

App funktioniert wunderbar, der Support ist schnell und zielführend, haben 2 Funktionen angefragt, die innerhalb kürzester Zeit einprogrammiert wurden (Rules für billing address, war vorher nur für shipping verfügbar).

Incredible service. Had the app for 5 minutes, and needed a custom feature/rule which wasn't included. Gordon from support created my new feature within 30 min.

This app really saved us. We have an integration with SAP, and some fields have character limits that can’t be changed. This app solved that issue, and we also used it to block sending orders to certain islands via ZIP code rules — which works perfectly. I highly recommend this app. We’re running it on eight stores now.

Great app for controlling the checkout process with custom rules! We mainly use it to block specific ZIP codes and set character limits in fields before the data gets pushed to Shopify — and it works exactly as needed.

What really stands out is the support team. When we first ran into an issue with ZIP code blocking, they quickly developed a new feature that supports both prefix and suffix rules. Later, when we needed to block something else, they genuinely tried to help — even though it turned out to be a limitation on Shopify’s side, not theirs.

Highly recommended if you need more control over your checkout fields and top-notch support behind it.

Very nice app - and especially very good and fast support. Thanks.

This is a fantastic product and the developer is extremely responsive and helpful! Great app!