you see ouyahama you can just get gift cards from qib also prepaid gift cards are like you just buy for a certain amount and use them online and throw them away :) like vodafone crdti cards :P but one thing is that you will always end up with 5-6 qr you can't spend :P because they have fixed amounts check there websites for more info

the credit cards if you pay them on time there is no intrest but if you get late in paying them back they will charge interest

and you can use some of the banks debit cards also just link them to your paypal account and then keep buying online where it is accepted :)