Apple Card stolen

there are 2 potentially applicable sections in this link

If your titanium Apple Card is lost or stolen

or

If your device is lost or stolen



Manage your Apple Card account - Apple Support

follow whichever applies to you

Jeffrw Said:

"Apple Card stolen: My card was physically with the iPhone"

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Modifying your Credentials:

Most certainly consider modifying your credentials, Immediately. Pefroming the following is best at this point.

• Modifying: your login credentials (using both a New eMail and a New Password) for Apple and each and all sites
• Associating: a different method of payment to your account
• Enabling: Two-Factor Authentication for Apple ID and for all other accounts that have such an applicable option

no problem, glad to be of help!