The auto-fulfillment feature is available in the PRO and PLUS plan, you can activate it by enabling this button. Once it has been activated, please go to "Settings” >> “Auto payment”, set the wallet as your default payment method, and select the default shipping method. 

When a new order is pushed from Shopify and matches the set shipping and sufficient wallet balance, the system will automatically pay for the order and deduct the amount from the wallet. Once the order has been paid successfully, then your order will be ready for shipment.