Entering a credit
Credits can be added from several different places in Main Street Sites. If you add a credit while viewing an enrollment, the enrollment and account will be pre-selected on the credit form. If you add a credit while viewing an account, the account will be pre-selected on the credit form.
This is what the credit form looks like when filled in from Manage > Accounts > Accounts:
Credit amounts are always negative. They are most often used in
conjunction with payments to reduce the actual amount paid for a set of
fees. For example, for each coupon used in online registration a
corresponding credit is created automatically. Credits are also used
when entering refunds to represent the amount of money you will be
returning to your customer.