Brits have been urged to check whether the contact details with their bank are correct immediately.
Money Saving Expert, the website founded by Martin Lewis, warned cardholders could risk having their payments declined.
It said transactions may be blocked if customers fail to update details as new anti-fraud rules will come in this summer.
The Financial Conduct Authority (FCA) told banks a person's identity must be verified to allow transactions by September 14, 2021.
But because of the impact of coronavirus, this has been pushed back six months to March 14, 2022.
However, the FCA said it will start checking if banks are rolling out the new rules from this month.
You'll be able to make up to five payments under €30 (£25) online before being asked to verify who you are.
Shoppers would have to enter their pin for payments over £25 when they're paying in stores.
A verification code will be sent through text, phone call, email, a generated card reader or banking app to be entered enter online.
But if your contact details are wrong and your card provider can't contact you, your payment could be declined, MSE warns.
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Martin's website urged customers to check their bank has their correct contact number and email address.
You can update your details online or through your bank's app, although some might need you to call up.
It comes as a lot of Brits have become victims of fraud during the pandemic.
Previously, Royal Mail urged shoppers to be cautious over a "highly convincing" scam.
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