Do you know how the .4% gets split? I watched a Khan Academy video quite a while ago, https://www.youtube.com/watch?v=nRzTaWZ6ebs https://www.youtube.com/watch?

Do you know how the .4% gets split? I watched a Khan Academy video quite a while ago, https://www.youtube.com/watch?v=nRzTaWZ6ebs https://www.youtube.com/watch?v=nRzTaWZ6ebs and Sal says the interchange fees charged by banks is on the order of 2%.