Validates cart, address, customer info. Implements VAT, house number, apartment checks, length checks, smart matching. reduces returns. Defines shopping future.

• 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