What will be done with the fee sheet in a PCT-Easy zip file when I pay the fees online?

If the required fees were paid online, the fee sheet from the zip file will be placed in the application file and will be forwarded to the International Bureau (IB). If the fees paid online are insufficient and the fee sheet includes proper authorization to charge fees to a specified deposit account, the Fee Sheet will be used to charge the deposit account to the extent authorized therein.

USPTO FAQ - Questions and Answers (15AUG2007)