I use Paypal, credit card and debit card.

I'd probably consider one of the other services if i found a merchant using them but i haven't.

As for problems with paypal, the only ones i have ever heard of are people who have their PayPal accounts frozen (while they have money in it) for some reason and can't get to their money. Personaly i'd never leave much money in a paypal account, it doesnt do you any good (not earning intrest). Back when I was selling off some stuff on e-bay i always keep the ballance below $100.

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