Riddle: I purchased 23 bucks of coffee and food in a Café. After waiting 10 minutes - some problems with Debit/Interact, they told me it was on the House. Which Café might this be?

It wasn't as simple as stated. They had me switching cash registers... finally I offered to pay cash...then they, delightfully, said it was FREE - how sweet that word is - of course I was happy... It made my day.