When you cancel an unfulfilled order on Shopify, the customer is typically refunded immediately. However, the exact timing can depend on the payment method used and the customer’s bank processing times.
By the way, if you use a third-party fulfillment service like Zopi, your order will sync with the app as soon as you receive it on Shopify. We assist you in fulfilling orders with just a few clicks. If your product is out of stock, we also help you auto-find and map the best suppliers quickly, so you can continue placing orders without interruption. Read this guide for in-depth information: What is Zopi? - Get started with Zopi