Using Scouting app:

Open the Scouting app and sign in. Pick the My Scout button.

Select your scout, and it will take you to his dashboard. On your scouts dash board, scroll the content options to the left to get to Payment Log.

In the Payment Log section it will show your scout's balance, what Outstanding invoices there may be, and your transaction History.  Green means there are unused funds in you account.

Red means that your scout owes money in excess of funds available in his account.