Merchant must process a credit to a credit card on a transaction when the customer is not present with card

With the Linga card reader, merchant cannot enter the credit card number manually to process a credit to a prior day's transaction.  The merchant needs to process a refund to the customer's credit card.

Linga needs a method to allow credit to a customer's credit card when the customer is not physically in the store.  Must have ability to manually enter the customer's credit card number, etc on a prior transactionIZ