Some modifications:
- Restrict sales to certified customers
Have different limits for each verification level:
- Email and number verification (level 1)
- ID and pic verification (level 2)
BTW, I value this restriction more since sooner or later, you'll be forced to go with this route (you might as well go with it from the start [based from what I've noticed recently]).
- Restrict sales during store hours (to avoid complaints)
Not just "store hours" but instead a few hrs prior to it (to allow for everything to be sorted out in the same day).