In the mobile app design world there are still a lot of uncharted terrains, which gives you some free hand to design new interaction design. But like always, all users have previous experience within the real world, websites, web-shops or application that mostly do the same when eCommerce is in there. Look at there years of experience and learn from them.
As you look at mobile eCommerce design, think of the way:
- payment (how, do you want to takeout your credit card in the metro?)
- information of the buyer (easy input?)
- easy and fast check out, without leave more then the necessary (only the delivery point address and persons name?)
Dutch Interaction Designer