taxes – How does tax work with crypto Debit cards?

There are plenty crypto debit cards, like Crypto.com’s or Binance’s. I can easily use my fund to purchase goods and services without taking profit out of an exchange, and just simply use the funds on it.

If I purchase coffee with a debit card like that, is it taxable?

And if it is, how do I even know or calculate my taxes?

Is there a specific rule on this in the EU?