What if shipping is more than estimated?
It's the seller's responsibility to correctly determine shipping fees before making an offer. Asking for an additional amount after payment is against the Stillwhite Seller Agreement.
If a seller asks for additional payment to cover shipping fees, the buyer may cancel the transaction or open a dispute to initiate a refund. For this reason, we recommend sellers absorb smaller differences in shipping fees.
If an incorrect amount was paid, the seller must cancel the transaction through PayPal and make a new offer. It is a requirement of PayPal's Buyer Protection to pay in a single transaction.