Banks and card issuers now have the ability to update your credit and debit card details that you have saved. When you save your card in Gymcatch the details are saved securely by Stripe.
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If the bank issue you a new card, they can update your saved cards (to save you the job).
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But if you haven't received a new card yet, or any notification from your bank that they are updating your card, you might be surprised when seeing a new card saved on Gymcatch.
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If you're not sure, check with your card issuer, but the reason for the change is an automatic update.