Smart checkout
rules.
Enforce business rules without adding friction. We build validation functions that verify age, validate addresses, prevent fraud, enforce limits, and ensure compliance—all while keeping checkout smooth.
Rules that
protect you.
Validation functions let us enforce business rules, compliance requirements, and fraud prevention at checkout.
Age Verification
Require age confirmation for restricted products. Collect birthdate, checkbox confirmation, or integrate with verification services.
Address Validation
Verify shipping addresses against postal databases. Catch typos, suggest corrections, and prevent delivery issues.
Cart Quantity Limits
Enforce minimum or maximum quantities per product, per category, or per order. Prevent bulk buying or meet minimum order requirements.
Fraud Prevention Rules
Block suspicious orders based on patterns, velocity, or risk signals. Require additional verification for high-risk purchases.
Business Policy Enforcement
Ensure compliance with your business rules. Product restrictions, customer eligibility, or promotional terms.
Geographic Restrictions
Block orders or specific products to certain regions. Comply with export rules, licensing restrictions, or shipping limitations.
Promotional Validation
Enforce discount code rules beyond native capabilities. Usage limits, product exclusions, or customer segment requirements.
Data Quality Checks
Validate phone numbers, email formats, or custom fields. Ensure clean data collection at checkout.
Inform and
protect.
Checkout notices that communicate important information to customers.
Checkout Notice
Display important checkout notices
Customs Duties Notice
Customs and tax guarantees
Shipping Note
Important shipping information
Protection that
works.
See how validation functions prevent problems and ensure compliance.
Regulatory Compliance
An alcohol retailer implements age verification at checkout with birthdate collection and legal disclaimers. Result: 100% compliance with alcohol delivery regulations.
Prevent Reseller Abuse
A limited-edition sneaker brand limits purchases to 2 per customer with address matching. Result: 80% reduction in reseller purchases.
Reduce Failed Deliveries
A DTC brand validates addresses against USPS database and flags PO boxes for physical goods. Result: 60% reduction in address-related returns.
Stop Fraudulent Orders
An electronics retailer blocks orders with mismatched billing/shipping or from high-risk regions. Result: 70% reduction in chargebacks.
Powered by
Shopify Functions.
Validation runs on Shopify Functions—serverless logic that executes in under 5 milliseconds, directly within Shopify's infrastructure, for zero latency impact.
Shopify Functions
- Cart Validation Function
- Checkout Validation Function
- Sub-millisecond execution (< 5ms)
- WebAssembly runtime
- Rust or JavaScript development
- Automatic scaling
Available Data
- Cart contents and line items
- Customer information and tags
- Shipping and billing addresses
- Cart attributes
- Product metafields
- Customer metafields
- Discount codes applied
Validation Actions
- Block checkout with error message
- Show warning messages
- Require field input
- Redirect to specific page
- Log for fraud review
- Trigger additional verification
Ready to customize
your checkout?
Tell us about your Shopify Plus store and the checkout experience you want to create. We'll discuss what's possible with Checkout Extensibility and how we can help.
Or email us directly: hello@thecheckoutagency.com