An automated vending machine for vending, accepting returns for, and restocking, vendible products. Vendible products are stored on moveable trays, resting on a shelving system, and are transported within the automated vending machine by a gantry system and dispensing unit. The shelving system and moveable trays can be adjusted to accommodate vendible products of varying shape, size, weight, and durability. The moveable trays are gravity fed forward into position for being coupled with the dispensing unit when selected. A supplementary storage area for restocking products and storing returned products is included.