good citizens pay on credit with their phones

A few times a week I eat at one of those corporate delis that promises the food is fresh and local, although it's probably neither. For about six months I used their loyalty card, which meant I got five dollars off roughly every tenth purchase. Yesterday I was told the loyalty cards had been decommissioned. Now the only way to get the discount is to install a smart phone app and pay by credit or debit card.
Wanted: more friends who skulk around without phones, paying cash, so we can feel better about ourselves as everyone gleefully receives their Borg implants (provided free by one of the six large banks).