Hi JF Robidas,
To my knowledge, there is no out-of-the-box credit card functionality in Dynamics 365 for Financials whereby you can add or store credit card information on the Customer card.
I assume you are either using an app/extension installed from AppSource, or perhaps you are thinking of Dynamics 365 for Sales or Dynamics 365 for Operations?
If it is an app that you've installed, I would suggest contacting the app publisher / vendor for an answer to this question.
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