Decide whether sizes should share the cap

If your maximum is 3 units of one product per checkout, decide whether different sizes should count together. A product-level maximum combines that product's variants. A variant-level maximum applies only to the selected variant.

A per-checkout cap is not a lifetime purchase limit. It does not prevent the same customer from placing another order, and should not be advertised as bot protection or fraud prevention.

Test the maximum before activation

1. Select the matching maximum product or variant quantity template.
2. Choose the product or variant, enter 3, and save a draft.
3. Run the Safety Check and try a sample quantity of 3.
4. Try 4 to check the value immediately above the maximum.
5. Review the results, then explicitly activate the checked version when ready.
6. Verify the actual supported Online Store checkout with your store's configuration.

Keep the scope clear

Meeting one maximum does not guarantee that a cart can proceed; another active rule may still block it. Sample-cart results are a simulator, not a completed purchase or proof of every checkout flow.

Shared limits across unrelated products, collection-wide limits, quantity multiples, and lifetime per-customer limits are not supported in this version. Explain your purchase conditions on your store and turn checkout rules off if a valid cart is unexpectedly blocked.