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If its a ''chargeback'' then its not a Paypal dispute, the buyer has gone directly to their card issuer as they must have funded their paypal payment that way.
So the card issuer makes all the decisions and if you lose then you pay their processing fee as well.
Normally if you met all the requirements of seller protection paypal would reimburse you BUT there is no seller protection for virtual / digital goods, you can sell them but at your own risk.