Credit card company (4)

I think it could be either:

Which length description are you looking for?:

8,7

visa

(Other definitions for visa that I've seen before include "Addition to passport" , "Passport stamp or well-known credit card" , "Endorsement allowing bearer to enter country" , "It allows the bearer to enter the country issuing it" , "Travel stamp in passport" .)

I've seen this clue in the Universal.

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