Afaik they&#x27;re mostly accepted in Europe via their partnership with the payment processing network of Diner&#x27;s Club (vs. directly seeing a &quot;Discover&quot; sign). Diner&#x27;s Club is moderately widespread but only in certain market segments, like restaurants and higher-end stores. Not many European ecommerce shops will take Discover or Diner&#x27;s Club, not even big ones like Amazon [1].<p>[1] <a href="http:&#x2F;&#x2F;www.amazon.co.uk&#x2F;gp&#x2F;help&#x2F;customer&#x2F;display.html?nodeId=502572" rel="nofollow">http:&#x2F;&#x2F;www.amazon.co.uk&#x2F;gp&#x2F;help&#x2F;customer&#x2F;display.html?nodeId...</a> or <a href="http:&#x2F;&#x2F;www.amazon.de&#x2F;gp&#x2F;help&#x2F;customer&#x2F;display.html?nodeId=504930" rel="nofollow">http:&#x2F;&#x2F;www.amazon.de&#x2F;gp&#x2F;help&#x2F;customer&#x2F;display.html?nodeId=50...</a>