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by jakub_g 4701 days ago
One issue I see is that very frequently on many pages there's not only distinction between say Mastercard or Visa, but also between different types of them. If you have Mastercard FooCompany Partner Card, then you pay less commission etc. Not sure if those partner types can be confronted with a regex (anyone from CC company there? :)

Usually those granular types are on a select list, if one chooses badly, she gots "transaction refused" without any more info (clearly not nice).