A buyer is requesting an extra postage service after paying. How do I invoice for that?

[bowerbirdbuys]

A buyer is requesting an extra postage service after already paying for the item and regular postage.

How do I invoice just for the extra service?

Cheers

[kopenhagen5 · Accepted solution]

If they paid by Paypal go into Paypal and send a funds request for the difference.

Their PayPal email address will be there already.