In the UK people predominantly use debit cards but credit cards are widely available. Everyone gets a debit card with any current account (i.e. non-savings account). In March this year there were 2.3 billion debit card transactions vs 400 million credit card transactions according to this:

https://www.ukfinance.org.uk/data-and-research/data/card-spe...

It used to be like that in Germany, it changed quite a bit. My debit card now is refused more often than my master card when I’m in Germany. I do tend to stay in large cities and not in the country side though, so my perspective is not a statistic.

But it definitely changed massively during Covid. Before Covid shops refusing _any_ card where still common (again, large cities is my spectrum) and debit card were accepted vastly more often than credit card.

In Ireland and the UK, from experience, people use debit cards a lot more than credit cards.