The module allows to make sale on credit in a single click. You do not need to take money from a customer each time. You'll be able to offer your customer make prepayment or pay periodically, e.g. once in a month. It's a good solution for small shops with regular customers.

Also, the customer is able to pay some part by cash and the rest by debt.

To make repayment of a debt create payment of another type, e.g. cash. This payment should be more than total amount of current order (also, you can use dummy zero price product). After this click on debt button and validate. Now difference between payment and total is amount of returned money