On the advice of here I have started doing 'free' or rather inclusive postage and thats working well. I sell clothes usually.
I'm always willing to offer combine postage army items lend themselves to being bundled up, but whats the best way of doing this to minimise having to pay fvfs on the refunded bit and to also avoid defects which is what happened recently when I cancelled and refunded and then issued a combined invoice.
Thank you !