King Checkout Validation

King Checkout Validation

Pricing
Free plan available. Free trial available.
Rating
5.0 (16)
Developer
Gordon Kihn

Featured images gallery

Prevent Unwanted Checkout
  • Missing House Number / Apartment / VAT number Checker
  • Prevent PO Box address
  • Maximum Field Length Checker
  • Prevent Unwanted Checkout
  • Missing House Number / Apartment / VAT number Checker
  • Prevent PO Box address
  • Maximum Field Length Checker
  • Customize validation rules through keywords and regular express
  • Easy to setup
  • Customized Combination Validation Rules

Block checkout with address, phone, order limit validation, and more

Use checkout and address validation to check shipping/billing addresses, block PO boxes, require house or apartment numbers, and validate postcode/ZIP, email, and VAT/tax ID. Run phone validation at checkout. Build custom validation rules with keywords, regex validation, field validation, cart amount, quantity, weight, products, customer tags, B2B status, country, and shipping-zone conditions. Shoppers see localized errors so they can fix issues and continue checkout.

Use checkout and address validation to check shipping/billing addresses, block PO boxes, require house or apartment numbers, and validate postcode/ZIP, email, and VAT/tax ID. Run phone validation at checkout. Build custom validation rules with keywords, regex validation, field validation, cart amount, quantity, weight, products, customer tags, B2B status, country, and shipping-zone conditions. Shoppers see localized errors so they can fix issues and continue checkout. more
  • Run checkout and address validation for shipping and billing addresses
  • Use PO box validation and detect missing house/apartment numbers
  • Checkout email validation, postcode/ZIP, VAT/tax ID, and phone
  • Create order limits by amount, quantity, weight, product, customer, or country
  • Use keyword, regex validation, field validation, and localized errors

Languages

English

Works with

Categories

Limit rules

Notification settings

Pricing

Free

Free

Features

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

Basic

$4.99 / month

or $49.90/year and save 17%

Features

  • 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

or $99.90/year and save 17%

Features

  • 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 (16)

Overall rating
5
Counts per rating level
  • 100% of ratings are 5 stars
    16
  • 0% of ratings are 4 stars
  • 0% of ratings are 3 stars
  • 0% of ratings are 2 stars
  • 0% of ratings are 1 stars
All reviews
May 10, 2026

Support was responsive and quickly implemented support for validating a new early access Shopify field to collect a required ID number in certain countries. Really appreciate the fast turnaround.

Retro
United States
About 3 hours using the app
May 7, 2026

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).

Tennis-Point
Germany
About 1 month using the app
April 23, 2026

Great support and service. Gordon is a major help!

Juvenon
United States
15 days using the app

Support

App support provided by Gordon Kihn.

Resources

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 staff and contributor data:

Store owner

  • Store owner

    Name, email address, phone number, physical address

View and edit store data:

Products, Shopify Functions

  • View products

    Products, collections

  • Edit Shopify Functions

    Cart and checkout validations

  • View other data

    Locales

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