I am successfully Authorizing Credit Cards, retaining the reference transaction ID, and using it for subsequent transactions (such as a capture or a new authorization). Before allowing one of my customers to make a new purchase via the reference transaction ID (using their 'card on file'), I would like to double check that this truly is their card. The idea is to ask them to provide the CVC to prove it is their card. I would like to validate that newly entered CVC against an existing reference transaction. Is this possible?
