As a Shopify merchant processing a high volume of orders, it may become tedious to log into your Shopify admin and manually fulfill and close each order. On that note, Shopify now supports automatic fulfillment of orders!
This may be especially useful for high volume sellers, merchants using fulfillment services, or merchants looking for a more automated workflow. Simply go to the Order Processing section of your Payment preferences to enable automatic fulfillment or automatic closing of orders.