A customer credit is money that you owe to a customer.
To process a customer credit or refund, you first need to record a credit memo and then record the settlement of the credit (for example, by printing a refund check for your customer).
Recording credits or refunds
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Reverse an existing sale. Use this method if the customer has paid for the entire sale. This method will automatically create a credit memo when reversal is recorded.
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Manually create a credit. Use this method if you are crediting the customer for part of a sale.
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Process from web store. Use this method if you have processed a credit or refund through your web store and you now need to reflect it in your company file.
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To manually create a credit for a non-item sale 

If you review the credit memo, you will see that the negative amount is now a positive amount. This is correct as it is a credit. Only a fee added should be a negative amount.