Hello Kathie ,
If the Buyer has bought through PaisaPay and there is some descripency regarding the total amount then officially the deal has to be cancelled and the amount refunded to the Buyer.
The Buyer can again buy the same by requesting the Seller to relist the same at the mutually arrived Price & shipping. (if it's a fixed Price Item)
There is no provision in the PAISAPAY to take extra amount.
Also, PayPal is not available on Indian site but in case the Seller has a PayPal account he may ask the Buyer to pay the extra amount through PAYPAL.
But this would be a Fee circumvention Policy violation.
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best regards
Umang Midha
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best regards
Umang Midha