Joshua is probably right. I used to work for a nationwide retailer that didn't take Discover for that very reason. The transaction fees were too high compared to M/C or Visa. Amex though is even higher.
I know a lot of places that do not take Discover Cards. Some Indian casinos do not take them so I wonder if it's something to do with the card.
Those cards have always had limited use. 4 as long as I can remember.
Too expensive apparently
Just too difficult dealing with the high transaction fee$
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