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I'm here to make sure you're able to remove the credit card number from your customer's account, @ldurand80.
In QuickBooks Online, deleting a credit card information is unavailable. We can update a customer's credit card information through the customer edit screen. Here's how:
This overwrites your customer's saved credit card info.
I've also added this article that can guide you update your customer's data in QuickBooks Online: Edit customer information.
Don't hesitate to comment down below if you need further assistance in managing your customer's information. I'm always here to lend a helping hand. Keep safe always.