I'm not a demo yet, but I believe it's the same as many other DS companies. You would retain your 20% off the top. You keep 20% of the subtotal before shipping and tax. By law you have to collect the shipping and tax, so the company must receive that.
Ex:
$100 in products (your 20% comes off that)
$10 shipping
$4.79 tax
$114.79 is the total, so take your $20 away from that and the rest, $94.79, would be due to SU!
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