Quick question on wholesaling a short sale

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I have a quick question on wholesaling a short sale. I understand the owner cannot receive anything. But is it ok for me as the investor to receive a fee for the deal or does it have to be done "double close". Could it be done by just signing a seperate promissory note with the end buyer? Is there another way to make this work without it being illegal and eating away at the wholesale fee with the double close.

Thanks