King Checkout Validation

Develop by Gordon Kihn

$4.99-$9.99

/ Month

Free plan available 7 Days Free Trial

Validate checkout information to prevent unexpected checkouts

Custom validation rules

Vat validation

Address check

Field length validation

Keyword matching

About King Checkout Validation

Launched Mar 14, 2024

Built by Gordon Kihn

Email :

[email protected]

Address

Baoan district, Shenzhen, GD, 510000, CN

Website Privacy policy Tutorial FAQ Document

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Description

Block checkout errors and enforce checkout validation with real-time address validation

Our app blocks invalid checkouts by detecting missing house/apartment numbers, validating VAT/tax ID formats, and filtering non-Latin characters. Customize address validator rules for field lengths, keyword restrictions, or regex patterns—adapting checks to cart value, product types, and shipping zones. Streamline compliance, reduce return rates, and prevent failed deliveries through automated error blocking—all managed in one dashboard.

Block invalid checkouts with real-time validation checks
Auto-detect missing house/apartment numbers, block Post office (PO) Box address
Validate fields base on keywords and regular express
Block non-Latin chars & enforce field limits
Customize validation rules based on combinations of order amount, weight, etc

Pros

Ensures validity of checkout details including cart, address, and customer info
Improves customer satisfaction by preventing common checkout errors
Lowers return rates by validating critical aspects like VAT, apartment details, and custom keyword matching
Customizable validation rules based on various factors such as order amount, weight, and discounts
Catches common invalid address entries like missing apartment numbers and PO Box addresses

Cons

Potential complexity in setting up and customizing validation rules
May require regular updates to keep up with changing validation needs and patterns
Could lead to customer frustration if the validations are too stringent or not clearly communicated

Top Helpful Reviews

GS-DEV-Stage

Jun 19, 2025 on Shopify

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.

VIVAIA Korea

Mar 20, 2025 on Shopify

He is an exceptional developer—truly the best. When it came to the new Shopify field, he resolved it immediately. His expertise and efficiency are truly remarkable. Once again, I would like to express my deepest gratitude for your support and dedication. Your contributions have been invaluable, and I hold your work in the highest regard.

A.Kjærbede

Feb 10, 2025 on Shopify

Created a new functionality, the day after reaching out on chat for advise on how to setup a feature, and testing the initial solution.

Simona's Luxury at Home

Feb 06, 2025 on Shopify

The app does its job smoothly and the support team is very quick to answer inquires and to fix issues. Gordon was a great help with the problems we have encountered.

Nozi

Aug 19, 2024 on Shopify

Very happy with the app for now! We installed it and works really easy. Also very quick customer service for any question!

Cape Town Origins

Apr 12, 2024 on Shopify

Gordon helped me very fast with solving an issue i had with the checkout. Thank you so much and i deff. recommend this app.