Can a ship charge be adjusted after an International sale?

[jimichrome]

Can a ship charge be adjusted after a sale?

A buyer in Canada won a small item but ship charge on invoice came to  $35.72 for a 3oz. item. (USPS priority.)

Package qualifies for 1st class Int. at $13.50, but I'm unable to make the lower $ adjustment in a second  invoice.  I go through all the recalculation steps via "send invoice" but am not able to assert or offer the lower rate? Is there a way?   Thank you.

ps: The lower 1st class rate was inadvertently not originally offered.  

[1tuna]

I would try to send an invoice before they pay....you can make the shipping whatever you choose and the amount 

[pjcdn2005]

I haven't sent an invoice in a while but if there is still a 'recalculate' button don't use it as it just resets the invoice to the original amount.  Just enter the correct amount and shipping method on the invoice and then send.