How do you send a CoD to someone?

Are you trying to send someone money or receive money? To receive money simply send them an item using the small envelope button at the bottom of your inventory. You add the CoD on the window that pops up. If it's JUST money that's being exchanged, people use cheap items with little to no value like mushrooms. You may sometimes hear players use the phrase "mushroom me" or something similar. This is what they mean.

To give money, a player has to mushroom YOU.

I think I get it... Thanks anyway!