A mounting flange having an insert with an exposed flange, an insert channel wall extending from the exposed flange, the channel wall defining an inner surface and an outer surface; and an anchor with an anchor flange, an anchor channel wall extending from the anchor flange, the channel wall defining an inner surface and an outer surface. One of the inner surface and outer surface of the insert channel wall defines a plurality of teeth and one of the inner surface and outer surface of the anchor channel wall defines a plurality of teeth for threaded engagement with the teeth defined on the insert channel wall.

The adapter of the present disclosure includes a circuit board with a processor and a switch thereon and a reader or transceiver connected to the board. With the adapter, a technician can retrofit an existing beverage machine to upgrade the dispensing and payment systems associated therewith. Existing beverage machines include a locking circuit that is key-enabled. This circuit allows an owner or technician to selectively allow and prevent beverage and/or ice from being dispensed. A technician can install the adapter of the present disclosure into the existing locking circuit. The board and transceiver of the adapter will detect when a user is authorized to obtain beverages, and close the circuit to enable this. To dispense beverage and/or ice, a user will present a valid credential to the board and transceiver. When no authorized user provides a valid credential, no beverage can be dispensed. The adapter can use a number of communication technologies to determine authorization. The adapter of the present disclosure can also include or work in conjunction with a mobile app on a user's device, that can check with a server to ensure that the user has paid for the beverage. A method of operating a beverage dispensing machine and retrofitting a beverage dispensing machine is also provided.