Deleting a CC when a patron requests it

Today a patron requested that we not store her credit card, which had been used previously for a number of orders. A Box Office staffer tried to delete the card in Tessitura, but of course the client complained that it couldn't do that since the CC is referenced "elsewhere in the system".

It is possible to borrow some code from the "Purge Credit Card Account Data" report to do this sort of thing, but we are wondering - what do other orgs do in a case like this? Is there a better way?

TIA for any replies.

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