Hi Pallu , I had balance. If you don't have a balance, I think PayPal can redraw it from your linked accounts. They can also keep a negative balance on your account. The next time you receive money, it will balance it out. They can also send you a mail/bill to request you to pay up just like a bank. So I don't think keeping a zero balance can protect you. Just don't use PayPal to receive payments because of its 180 days refund policy and buyer always wins.
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