Online payments require authentication, keeping everything Apple is convenient.
I didn't even mention offline payments, but even there European banks seem to think Apple have a very good lock on their customers there too ... they pay huge fees to Apple for every NFC Apple pay transaction (not as huge as in the US, but still huge by European standards). Things are snowballing, Apple's market power is incomparable to Google's ... Google just can't keep up offering equal services in many areas, or when they can they make less money on it.