How to make manual Refund to Customers in R12

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Summary

We need to account the money that is paid back (refund) to customer in apps. In 11i we are forced to create customer as a supplier, pass credit memo, prepare invoice manually in AP and issue payment in AP. There is a new functionality to pay back money to customer in R12.
Example for Refund: Amount paid back because of an over collection or the return of goods sold called refund. or The reimbursement of the purchase price of a good or service, for reasons such as defective goods or dissatisfaction with the service provided to customer.
How to make manual refund to customer?