Magento 2 Saved Credit Card by Meetanshi lets customer save their credit card details in the Magento 2 database using built in encryption for offline order processing.:
The default offered the feature to save credit card details in encrypted format for offline order processing. However the Magento 2 platform does not support it. To overcome this default limitation, Meetanshi has developed Magento 2 Saved Credit Card extension.
The extension allows customers to save the credit card information in the database using the Magento’s built-in encryption mechanism. Use the method when you have a card terminal in a brick and mortar store or have access to a virtual terminal.
Note: It is advisable to check the PCI Complaince standard applying to your country before using the Magento 2 Saved Credit Card module
Benefits of Magento 2 Saved Credit Card:
• Save credit card details including card type, number, and expiration date.
• The extension saves the credit card details in the encrypted format.
• Use the saved information for online and offline orders.
• For offline orders, use the Magento built-in CC validation
• Display custom title for the payment method.
• Display credit card logo on the checkout page.
• Set status for the new orders placed using this payment method.
• Allow selected credit cards to allow using this payment method.
• Allow selected countries to use the Saved Credit Card payment method.
• Let admin see the customers’ credit card details.
• Admin can wipe out the credit card information after processing the order.
• Collapse the credit card details view by enabling the mask mode.
• View the credit card details using the “Show” link in the backend.
• Display additional details on the checkout page.
• Set conditions for the order total to use the saved credit card details.
• Let customers check the payment details from the “My Account” section.
• The admin can navigate to Sales > Order view in backend to see the payment details.
For more information, visit https://meetanshi.com/magento-2-saved-credit-card.html
Meetanshi 
If you are using an existing payment gateway for credit card processing, can you still use this extension? Would you be able to use this extension to simply store card data and then your existing payment gateway to charge the credit card stored?
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Hey, Steve.
Yes, its possible to charge credit card data by using existing payment gateway. Let me know by using which payment gateway you want to charge saved credit card.
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