Complicated Customer Account Business Scenario!

Hi Experts,

We have a Customer Account abroad who pays when he receives his ordered items and their related official Invoice.

Now the shipping of his goods takes around 15 days.

So basically his Payment Term should be immediate since he's paying directly when he receives the goods and the invoice but if we define his payment term as Immediate, the Due Date on the Invoice would be the same as the Invoice Date (which is correct) but will be earlier than the receipt date as if he was late on the payment (which is wrong)!

And if we define the payment term as 15 days from Invoice Date let's say, this will also be wrong since he is paying immediately when he's getting his invoice and goods.