App Overview
King Checkout Validation enhances your Shopify store's checkout process by ensuring data accuracy and compliance. It automatically detects missing house or apartment numbers, blocks PO Box addresses, validates VAT/tax IDs, enforces field limits, and blocks non-Latin characters. With customizable rules based on order characteristics like value and weight, all managed in a single dashboard, the app streamlines compliance, reduces return rates, and prevents delivery issues through real-time validation.
Screenshots

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.
Key Features
- 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
Best alternatives to King Checkout Validation
Blockify Checkout Customizer
Checkout rules, checkout customizer and discounts to boost AOV
Madgic Order Limits Quantity
Set MOQ (Minimum Order Quantity), Product Limit, Cart Limits
King Checkout Validation FAQs
Yes! Try King Checkout Validation free plan. For more details about King Checkout Validation pricing, check here.
