Prebuy turns inventory you have on order into preorders on Shopify. Connect your purchase orders and shipment ETAs, and Prebuy lists those products for sale before stock lands. Product pages show delivery dates from each purchase order, and inventory caps match the units on the way, so you cannot oversell. When stock arrives, held orders release in order and fulfil automatically. Delayed shipments notify customers via Klaviyo. Works with Shopify Markets and multi-location inventory.