Credit cards have a magnetic strip (swipe type) with their information on them. Magnets could erase this info. Nowadays, most cards have chips (insert type and/or tap type) which aren’t damaged by magnets. The magnetic strip still usually exists as a backup, and still is likely damaged by magnets. If you’re holding your card near magnets, the strip is probably erased, but you can still insert or tap with it but likely not swipe.
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