In order to be able to collect a fees in advance from a customer, we will first go to the customer's file. 

We can choose the customer from the list under Costumers → Costumers.

We will then choose the option Fees to see a list with all the subscriptions. 

To see all the installments we will click on the magnifying glass next to the subscription.

From the window below, we will click on the button Receive Next Fee to choose a form of payment and collect the fee.