Originally Posted by
Kremmen
Except that there is no such thing as "the" selling or buying rate. It's the rate Visa feels like charging. The rate for a refund could be the same, but Visa chooses how big a spread to put on it, without quantifying what that fee is.
Why would any lender or forex trader buy and sell at the same rate? There will always be a spread. The question would then be whether Visa's spread is competitive or excessive.