Refunding a Customers Card
Issuing a refund to a renters card means that the money/amount will be returned onto their card/method of payment
Applying Credit to a Customer
Applying a credit to a customer's Anytime Mailbox account will decrease the customer's current balance (if there is any), meaning that the amount they owe is lower.
If the customer does NOT have any balance when a credit is applied, it will show as a minus on their statement. The credit will be used towards future charges/balances on their account.