Someone please explain all the various methods to collect your assignment fee?

Hello,
Ive been mind boggled about collecting your assignment fee. I definetly know an investor can pay your assignment fee to you straight out of his pockets, but I know there has to be times that the investor doesnt want to pay you cash right out of his pockets. Please explain all the various strategies you can use to get your assignment fee, including a double closing? Thank You

hello,
I know for me it is not a double closing. My assignment fee is on the settlement sheet and collected at settlement.