I seem to have collected a stack of credit cards which I only occasionally need (like Amex for Costco and a US dollar card). I'd rather not carry them around so I was thinking I could maybe take photos of them and store them on my iPhone and then give my number to a retailer or use them online without having a physical card with me.
iPassword seems good for online stuff but not offline. Google wallet doesn't seem to do the trick.
Do any of you do this? Any recommendations would be great.