I'm curious what this really means "... to purchase items anywhere that accepts international payment cards."
Will stores have to have something at the point of sale to accept/swipe the card, be willing to accept the crypto-currency as payment, or will it swipe and work as if they are accepting native currency through some kind of immediate exchange to fiat?
Are these "international payment cards" accepted in the same vein as Visa & Mastercard?
Maybe I missed something in the details (which are understandably in the works) but
Openledger and Bitshares have smart coins like bit.USD, bit.EUR that are pegged at the value of the fiat currency they represent. I guess Ocash will use them under the hood - you'll either hold a balance of those for spending or there would be some instant exchange to the smart coin from the asset you want to spend; the OCASH card will probably use visa or mastercard tech so it should be accepted at any regular POS.