Cart limits reset after every order, which means determined buyers can purchase repeatedly. Lifetime limits track what each customer has bought across all their orders and block them once they hit the cap.
Shopify just changed three checkout field defaults for non-Plus merchants. One makes guest checkout weaker for limits. Another creates an opportunity. Here is what you need to know.
Every method for identifying repeat customers has trade-offs. Email is easy to duplicate. Phone numbers are harder to fake but not impossible. Addresses can be varied in dozens of ways. Here is what Shopify merchants need to know in 2026.
Most limit apps only cap quantity per cart, so customers just place a second order. Here is how to enforce a true 1 per customer limit that tracks purchase history across orders.