CartShield: Discount Blocker

Block discount codes at checkout and on products. Protect your margins and prevent coupon abuse.

CartShield lets you control which discount codes are accepted at checkout and on products. Create rules to block all codes, specific codes, or codes based on products, collections, customer tags, or cart total. The Allow List lets you whitelist approved codes and block everything else. Smart Discounts apply discounts only to full-price items, skipping products already on sale. Every rule shows a custom error message to customers. Powered by Shopify Functions for instant performance.

• Block discount codes by product, collection, customer tag, or cart total
• Allow List: whitelist specific codes and block all others at checkout
• Smart Discounts: apply discounts only to full-price items, not sale items
• Custom error messages per rule shown instantly to customers at checkout
• Activity Log to track every blocked code attempt and identify abuse