Product refunds can also contribute to a negative balance. When a product is purchased and refunded during the same settlement period, the negative impact on your account is minimal because Amazon Services will only retain the lesser of Rs.300 or 20% of the original listing fee in order to cover transactional costs. These fees are generally offset by other sales. However, if you issue a refund for a product for which you have already received payment during an earlier settlement period, Amazon Services will charge you the full amount of the refund in order to recover the previous payment.
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