Our store is selling an at-home ring carving kit. Our customers are sent the kit, and send us back the molds to be cast into rings. We need to be able to identify which mold belongs which which customer/order, and ideally be able to send the molds directly to production. We're looking for a way for our Shopify store to automatically add serial numbers to all of our kit orders (which would then need to be searchable, and included on their CRM and invoice), and are running into a brick wall. Has anyone been able to figure this out? We've been scoring the message boards and only discovering dead ends!