less than a minute read • Updated 2 hours ago
Enable HMAC product validation
How to turn on HMAC product validation in your store settings.
Before signed product links and forms will be validated by Foxy, you need to enable cart validation in your store settings.
## Steps
1. Go to the [Foxy admin](https://admin.foxy.io).
2. Go to Settings > Cart.
3. Under the Advanced section, enable the "Prevent product link and form tampering" option.
## Notes
- Once enabled, validation is all or nothing — every parameter on every add-to-cart link and form must be signed. Unsigned parameters will be rejected.
- Enable this setting only once you have signed all of your existing links and forms, or you will break your add-to-cart functionality.