King Checkout Validation

Name: King Checkout Validation
Brand: Lightcone
Rating: 5.0 (19 reviews)

Pricing: Free plan available. Free trial available.
Rating: 5.0 (19)
Developer: Lightcone

Install

Checkout validation rules with clear errors for shoppers

Block checkout with address validation, order limits and custom checkout rules.

Use checkout validation to check shipping and billing address fields before orders are placed. Block PO boxes, require house or apartment numbers, and check postcode/ZIP, email and VAT/tax ID formats. Match phone country codes to address countries. Set order limits by cart amount, quantity or weight, with conditions for products, customer tags and countries. Use keyword, regex and field-length checks. Show localized error messages so shoppers can fix issues and continue checkout.

Address validation: block PO boxes and require house or apartment numbers
Set order limits by amount, quantity or weight for products and customer tags
Check postcode/ZIP, email and VAT/tax ID formats with checkout field rules
Match phone country codes to shipping or billing countries
Build keyword, regex and field-length rules with localized error messages

Languages

English, German, Dutch, French, Italian, Spanish, Portuguese (Brazil), Japanese, Chinese (Simplified), Norwegian (Bokmål), Turkish, and Finnish

Works with

Checkout
Shopify Admin

Pricing

Choose the plan that best fits your business.

Free

Features

Free for development stores
Create and test validation rules

Basic

$4.99 / month

or $49.90/year and save 17%

Features

Live chat and email support
Require house, apartment or suite number
Require VAT numbers
Block PO box addresses

7-day free trial

Premium

$9.99 / month

or $99.90/year and save 17%

Features

All Basic features
Detect non-Latin characters
Set checkout field length limits
Match keywords in checkout fields
Build regular expression rules
Combine cart and customer conditions

7-day free trial

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

Reviews (19)

Overall rating

Counts per rating level

100% of ratings are 5 stars
19
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

June 15, 2026

Excellent product and excellent support. Many of our customers use freight-forwarding service and will forget to enter their Suite numbers in shipping addres causing the orders to fail, be sent back. Result is no sale and loss of initial shipping charge. No longer have this problem thats to King checkout

Nemechek Protocol

United States

3 days using the app

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

July 24, 2026

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.

yarnstore.de

Germany

1 day using the app