Still cannot send a combined postage discount invoice to customers

[mabb3063]

I have been trying all yesterday evening to find how to send a combined postage discount invoice to customers still no luck I think Ebay mght have changed something as I followed their instructions but there is still no way of finding an invoice to send with combined costs
I have sent one customer a message to send me the Request total from seller apparantly it says then I can send an invoice with the new combined costs
Anyone know if it works like this please 

[john1297576]

As far as I am aware the simple way to send a combined invoice, is to click on SEND PAYMENT DETAILS. 

That will produce an invoice, but depending on what has been bought there are circumstances where  an invoice cannot be sent.

If buyers pay in full, refunding the overpayment is simple enough.