OK. How is this related with my cup of coffee I'm trying to buy?
The whole cup of coffee thing was never my main point at all but in any case I am sure that you are familiar with "vouchers" (or "coupons") for shopping, restaurants, etc. (and yes maybe even your cup of coffee).
If ppl trade vouchers what dose it mean? Thats right its a currency.
You really think ppl here would take you serious for such lack of basic knowledge?
My guess is you just want to avoid calling it "coins" as much as possible and failed terribly.