No, that is not possible on BrickOwl (and I hope it never will be). There only 2 kinds of 'fees' on BrickOwl, the shipping cost and an "Order combining fee"
That's the one reason I never pick an order before payment. I made the mistake trying to get ahead with a huge order in the early days, then they cancelled, so not only hours wasted picking, I then had to restock everything. I find customer rarely cancel, but better safe than sorry.
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There only 2 kinds of 'fees' on BrickOwl, the shipping cost and an "Order combining fee"