Agree! I used debit card and credit card interchangeably (wrongfully so) but if you're interested in the credit part, there's a nice writeup by moon settler:
https://gist.github.com/moonsettler/42b588fa97a1da3ac0adea0dd16dadf2
Credit would require either collateral or an account so the credit issuer can make sure that you pay off your debt.