Guidance explains the next step
Storefront guidance gives shoppers context while they build an order. A progress block can show the remaining amount toward a minimum, while a summary can organize cart information. These experiences depend on the theme and the cart surface.
Validation checks the order
KartVantage’s supported published checkout rules use Shopify Functions for server-side validation. That is the authoritative rule check. A progress bar or visible message should not be mistaken for enforcement.
Why a theme preview is not enough
A block can look correct while a rule is still a draft or has not synchronized. Equally, a checkout rule may be published while guidance is missing from the active theme. Check the app’s publication and health information alongside the storefront.
Run a complete test
- Create one cart that should pass the rule.
- Create one cart that should be blocked.
- Check the cart message for each case.
- Continue each cart to checkout and confirm the result.
- Repeat on desktop, mobile, and supported cart surfaces.
Keep the message aligned as rules change
When you change a threshold, exclusion, or product selection, recheck both the visible guidance and the checkout behavior. Use version history and rollback when appropriate, and review synchronization after changes.