How long can offline transactions be stored for?

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Used my card (AMEX) at a local fast food outlet several times over the years. I think the transactions are processed offline (I am using contactless, and they never appear under “pending”). Most of the time they are debited in a timely manner from my card – a few days later. A while back one took 3 weeks to come off. I keep track of all my transactions and a purchase there over 2 months ago has not been debited yet – it was the last time I used the place.

How long can they keep it in some sort of stored state before it becomes invalid?

Last edited by fun4everyone; Today at 1:07 PM.

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