What point of sale terminal do you used for debit and credit cards?

It depends on which POS solution do wish to deploy. Some POS app only support iOS, some support Andoids, and some support both. If you are trading goods, you may deploy an inventory management app with the mobile sales feature for POS.

https://go.tradegecko.com/register?code=fiat-lux

https://www.zaperp.com/ref/25/

What kind of business do you run?