
King Checkout Validation
- Pricing
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Free plan available. Free trial available.
- Highlights
- Use directly in Shopify admin
- Rating
- 5.0 (8)
- Developer
- Gordon Kihn
Featured images gallery

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
- Highlights
- Use directly in Shopify admin
Languages
English
Works with
Categories
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)
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.
This is a fantastic product and the developer is extremely responsive and helpful! Great app!
Created a new functionality, the day after reaching out on chat for advise on how to setup a feature, and testing the initial solution.
Support
App support provided by Gordon Kihn.
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
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Store owner
Name, email address, phone number, physical address
View and edit store data:
Products, Shopify Functions
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View products
Products or collections
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Edit Shopify Functions
Cart and checkout validations
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View other data
Locales
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