Retail purchasing computer system and method of operating same

A retail purchasing computer system associated with a retailer is described herein. The retail purchasing computer system includes a retail server computer including a processor coupled to a memory device. The retail server computer receives, from the mobile computing device, a signal including an item identifier associated with an item for sale by the retailer, accesses an item database and retrieves item information associated with the item identifier, and transmits a signal including the item information to the mobile computing device. The mobile computing device displays the item information and the operational input on the touchscreen upon receiving the signal including the item information from the retail server. The retail server computer receives a purchase signal including the item identifier and a unique user ID, transmitted when a predefined number of consecutive touch inputs of the operational input by the user via the touchscreen.