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Unsure how to issue a credit to a card

I have a running application that makes charges to customer cards using createTransactionRequest. It takes deposits from the customers but does not actually store any transaction id in the database.


Due to the COVID-19 situation, I need to issue credits. I have the customer and payment profiles but not anything about the original transactions, so my intent is to see if the accounts on my system show a credit balance (which they should) and then I will issue credit transactions for therefunds.


Is this possible without saving the original transaction id? Would I use the createTransactionRequest again, but with a negative amount? Or is there some other transaction? If I can't do this, then my customer will have to manually credit about 2000 of its customers.