how do I change postage amount on invoice that was sent

I sent the buyer wrong amount for postage. I resent invoice, now I have two invoices listed for same item. with the lower one being correct.

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Contact the seller and tell her to pay the lower amount....

There is drop down menu, change to lower shipping first and correct price, then higher amount.

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Contact the seller and tell her to pay the lower amount....

Contact the seller and tell her to pay the lower amount. Apologize for any problem.

When she pays, mark the listing as paid.

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