Invoice for buyer to pay extra postage on item

[wabbie]

Hi I'm really struggling to find out how to send an invoice. The postage was far more than what was paid buyer is happy to pay extra thanks 

[roger_roger_over_and_nowt]

You can't send an invoice for extra money.

Only work around i know of is to cancel the order,refund in full and then relist as a buy it now at correct price,