When a customer orders twice, or bypasses a one-per-customer promo using several emails at one address, Duplicate Order Defender notices as each order arrives. Flagged orders wait in a review queue with plain evidence: the matched email, address, or phone, and the time between orders. Matching sees through Gmail aliases, and related orders group into one cluster. The app tags flagged orders and, if you enable it, pauses fulfillment until you review. It never cancels or blocks checkout.

• Evidence on every flag: the matched email, address, or phone, and time window
• Clusters limit-bypass orders placed across different emails at one address
• Optional fulfillment holds pause flagged orders until you review them
• Scans your last 60 days of orders the moment you install
• Adds possible-duplicate order tags that work with Shopify Flow