That's the website owner/designer showing empathy for its users.
People want to know you're legit. Sometimes showing security/credit card icons helps make people feel warm and fuzzy because they know their purchase will be handled securely and safely.
As far as studies go, I've got nothing! :) But my best guess is that it's geared around making the user feel like it's 100% okay to make a purchase.
Quick Edit: Demographic is also a good reason. Certain cards aren't accepted everywhere.
That's the website owner/designer showing empathy for its users.
People want to know you're legit. Sometimes showing security/credit card icons helps make people feel warm and fuzzy because they know their purchase will be handled securely and safely.
As far as studies go, I've got nothing! :) But my best guess is that it's geared around making the user feel like it's 100% okay to make a purchase.
Quick Edit: Demographic is also a good reason. Certain cards aren't accepted everywhere.