Do you feel comfortable using a credit card to purchase something on your smartphone? I haven't done it yet, and I don't know if there's some kind of security I need to download first? You can tell on a computer if you have a secure site, but I haven't noticed that anywhere on my smartphone.
) and I also use the Starbucks app (again, SOOO easy to buy coffee!!) I don't know if I would use my card to purchase something from a place I've never heard of, but I've used it for reputable places.