King Checkout Validation

King Checkout Validation

Pricing
Free plan available. Free trial available.
Highlights
Use directly in Shopify admin
Rating
4.7 (8)
Developer
Gordon Kihn

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.

Our app blocks invalid checkouts by detecting missing house/apartment numbers, validating VAT/tax ... more
  • 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
Highlights
Use directly in Shopify admin

Languages

English

Works with

Pricing

Free

Free

  • Free of charge for development store
  • Creating rules in test status

Basic

$4.99 / month

  • Live chat, email support
  • Missing house number, apartment, suite
  • Missing VAT number Checker
  • Prevent Post office (PO) Boxes

7-day free trial

Premium

$9.99 / month

  • All from "BASIC"
  • Non-Latin Detect
  • Field length Rule
  • Matching keywords Rule
  • Regex Express Rule
  • Customized Combination Validation Rule

7-day free trial

All charges are billed in USD. Recurring and usage-based charges are billed every 30 days.

Reviews (8)

Overall rating
4.7
Counts per rating level
  • 75% of ratings are 5 stars
  • 13% of ratings are 4 stars
  • 13% of ratings are 3 stars
  • 0% of ratings are 2 stars
  • 0% of ratings are 1 stars
February 6, 2025

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.

Simona's Luxury at Home
Romania
3 months using the app
February 10, 2025

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

A.Kjærbede
Denmark
3 days using the app
March 20, 2025

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.

VIVAIA Korea
United States
1 day using the app
August 20, 2024

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

Nozi
Belgium
About 3 hours using the app
Gordon Kihn replied August 21, 2024

Thank you so much for your kind words! We're thrilled to hear that you enjoyed using our app. Your feedback inspires us to keep improving and providing the best experience ...

May 22, 2024

Very good app for checkout validation, and the support team is very responsive.

Flying Tiger Copenhagen
Denmark
About 2 months using the app

Support

App support provided by Gordon Kihn.

Developer

Gordon Kihn

Baoan district, Shenzhen, GD, 510000, CN

Launched

March 15, 2024

Data access

This app needs access to the following data to work on your store. Learn why in the developer's privacy policy .

View personal data:

Store owner

  • Store owner

    Name, email address, phone number, physical address

View and edit store data:

Products, Shopify Functions

  • View products

    Products or collections

  • Edit Shopify Functions

    Cart and checkout validations

  • View other data

    Locales

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