WizChip "Drink Coin" or "Drink Chip"
"A bar chip, or more commonly called, drink chip, is “a form of exonumia used in drinking establishments” it's something you receive when someone buys you a “backup” drink. ... The bartender or typically another patron then decides to buy you another drink."
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WizChip by Tab Wizard
WizChips are the digital form of the old “Drink Coin” or “Drink Chip”. WizChip is a tracking system allowing increased sales & inventory tracking and repeat customers.