I will show you the way some POS agents actually dupe their customers of money.
POS is a method of payment that don’t involve you going to the bank, all you have to do is put your ATM card into the POS machine and then you can carry out transactions like withdrawals.
Some fraudulent agents when you meet them that you want to withdraw, they will complain of bad network and suggest that they have to use their phone to carry out the transaction and that requires your ATM details.
Once you do this several times, the app saves your card details and the app no longer requires OTP to carry out transactions and that means they can carry out withdrawal from your ATM card in your absence.
So please do not ever reveal your ATM card details to anyone.