For someone that only uses Apple Pay, this remains a constant worry.
Martin Lewis' warning about contactless payment method, Apple Pay, is a reminder that you should think twice when making purchases.
Throughout the years, the 'Money Saving Expert' has been helping us do just that amid the ongoing cost-of-living crisis.
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But rather than saving money, this time, the 51-year-old has told us how not to lose money.
When it comes to contacts payments via a physical card, there is usually a £30 limit on how much you can spend.
Since the pandemic, the limit has gone up to around £100 and each bank may have a slightly different limit.
However, with Apple Pay, there is no transactional limit whatsoever.
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When appearing on BBC 5 Live, Lewis was asked by a viewer about the security of Apple Pay.
"Secure is an interesting question and I wouldn’t pretend to be a fraud security expert," he admitted.
"Because of that you could argue, if someone were to access your Apple Pay it is less secure as there is a bigger risk."
He explained: "This is all about technological security. As long as you’re doing everything right you should be protected.
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"There have been problems with contactless cards when payments that shouldn’t happen have been taken off them, but there are problems with all types of payment systems.
"There is fraudulent and fake cash that goes out. In general, I don’t have a problem with using either Apple Pay or contactless."
Staying on the topic of cashless payments, Lewis has recently declared that UK citizens shouldn't get too 'hung up' about their credit score.
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Speaking on This Morning, the financial guru said: "You do not have a credit score in the UK.
"The one that you're given by the credit reference agencies is just their indication of a loose guide to what a typical company might look at, if it was only looking at your credit history."
With regards to the 'single most important factor' is, he said: "If you had no income and a perfect credit score, and you wanted a loan, you're almost certainly not going to get it because you can't pay it back.
"So when you tell me you've been rejected, what you haven't told me, is the crucial factor. You talked about being made redundant.
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"Well, if you've been made redundant and you don't have a job, and you don't have income even with a great credit score, it is going to make getting credit much more difficult."
Featured Image Credit: Getty Stock Photo / ITVTopics: Martin Lewis, Money, UK News, Apple