1. A method of authenticating a bulk quantity of a consumable product with a key which enables a dispenser to enable a plurality of distinct user-initiated consumption events of the consumable product comprising the steps of:a) reading a key, using a key reader, the key reader being operatively connected to a controller, wherein the key comprises information relating to a consumption parameter of the consumable product;
b) authorizing, using the controller, the read key with a bulk quantity and the consumption parameter from step a) to a specific dispenser wherein the bulk quantity and consumption parameter are correlated to a quantity value;
c) monitoring, using a use detector operatively connected to the controller, consumption of the consumable product over a plurality of distinct user-initiated consumption events thereby monitoring how much consumable has been consumed over a period of time until the quantity value is reached, wherein before the quantity value is reached the authentication of the bulk quantity of consumable product remains valid;
d) enabling, using the controller, an event output in response to the quantity value being reached, wherein the event output comprises altering the operation of the dispenser when the quantity value is reached.