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No. Bagnetique will not harm your credit cards! But if you have datastrip cards you should always keep them in a wallet -- it is very very rare, but demagnetisation can happen if there is direct contact with any magnet over a sustained period of time. Chip cards are 100% safe from magnetic fields.
The story of magnets and their interactions with datastrips is quite interesting, and there is a lot of misinformation out there -- if you want to get deeper into the details and the science bit, See the long answer in this blog post!