You note the idea of them ordering every day, are the goods moving that fast that it makes financial sense for daily orders? Normally these shops are ordering weekly or biweekly.
Do you work with the Principals at all (e.g. Coca Cola) or just directly with the Distributors?
Did the merchants already have smart phones and digital literacy to be able to easily download and leverage your app or was it a process of teaching them how to use it?