The shipping charges are to be paid while booking the shipments online on

However there are incidental charges like Return to Origin (RTO), Weight mismatch etc. which would be billed at the end of the month or earlier whenever the partner updates. While invoice is generated the amount would be deducted from your wallet balance. If balance is low then it may become negative also depending on the charges.

The outstanding can be settled by making a payment online or recharging the wallet.