The Billing section is accessible from the main menu (right next to My profile, Notifications, and Apps) by the organization's owner in Evalato. There you can see a breakdown of any sales for that organization, as well as other balance status updates.
"Sale" shows every time someone registers for your program and the amount the registration cost, depending on the number of applications registered.
"Debit" is the service fee charged by Evalato for that Sale, it's a flat fee of €3 per application, so you get Debit charges of €3, €6, etc.
"Credit added" marks when you cancel/delete a registration or some application within it and the original service fee charged for it gets credited back into your account balance.
"Automatic payment" happens every 1st and 15th day of the month, if there's an accumulated service fee from the previous billing date.