Long ago we used to have ‘mini’ credit cards. You could get a two-thirds size magstripe card from some major banks that’d go right on your keychain. Discover had a cute little bean keychain with a flip-out magstripe card (the Discover2Go) as well.

At the same time there was also the Exxon-Mobil Speedpass RFID fob, and I remember there being a huge discussion about “the battle of the keychain” and whose payment instrument would win being on your keys to be used the most alongside your loyalty cards.