When you receive a payment, you are liable to PayPal for the full amount of the payment sent to you plus any fees if the payment is later invalidated for any reason. If the buyer paid in another currency, the full amount of the payment sent to you may be calculated in that currency, using PayPal's transaction exchange rate (including our
currency conversion fee) at the time the refund or reversal is processed. If your PayPal balance is insufficient to cover your liability for the payment amount plus the fees, then this will result in a negative PayPal balance. Any negative PayPal balance represents an amount that you owe to us, and, in this situation, you must immediately add funds to your PayPal balance to eliminate it. If you do not do so, PayPal may:
- recover any amounts due to PayPal by debiting your balance;
- engage in collection efforts to recover such amounts from you;
- take any and all action as outlined under Amounts owed to PayPal; or
- place a limitation or take other action on your PayPal account as outlined under Restricted Activities and Holds.
https://www.paypal.com/ga/webapps/mpp/ua/useragreement-full