A delivery service (DS) computing device for item purchase and delivery is provided. The DS computing device displays a searchable interface that enables a user to select at least one merchant. The DS computing device receives at least one selected merchant location from the user, displays item data of the at least one selected merchant location, and receives cart data from the user. The DS computing device receives, from the user, a selection of a selected carrier, and transmits the cart data to the selected carrier. The DS computing device generates a secure virtual account number for the selected carrier. The secure virtual account number provides access to purchase funds for use, by the selected carrier, in purchasing the selected item. The DS computing device processes a payment transaction for the at least one selected item that includes the purchase funds and a delivery service fee.