My buyer was going to collect but now he wants me to post item. How do I send him an invoice

[nokkie21]

My buyer has paid for the item. However, he now wants me to post the item to him. How do I send him an invoice just for the postage?

[plpmr]

Adding to the advice already given -

Depending on the item's value remember that if you do post the item it was sold as collection and you are therefore open to any of the usual problems of accepting PayPal for a collected item - even if you send it tracked you won't be protected.