Custom Tax Endpoint
Sending real-time tax requests to your own server — a fit for ERP-driven rates, unusual tax rules, or any setup the built-in tax options don't cover.
Custom tax endpoint overview
How a custom tax endpoint works: your own server calculates and returns tax rates for a cart, useful when built-in tax options or supported integrations don't cover your needs.
Custom Tax Endpoint Reference
Reference for the Foxy custom tax endpoint, including webhook events, response format, and example payloads.
Set up a Custom Tax Endpoint
How to use a custom tax endpoint to calculate taxes with your own system, including the Netlify starter function code.
Validate VAT IDs at checkout
How to validate a customer's entered VAT ID at checkout using the pre-payment webhook and Vatlayer, since the tax ID field itself doesn't check validity natively.