By 10 get 1 free loyalty

our main loyalty is when a customer has purchased 10 coffees (over a period) and is entitled to get one free for every 10 they buy.

this is a standard industry wide loyalty scheme used in every coffee chain i have ever been in..,.

Ideally we want the customer name etc (data) in the system so we can use it for future offers...

currently they hold a cardboard credit card size card that we punch holes in for each coffee they purchase... when they have purchase 10 coffees (card is full of holes) then we give them a free coffee