Ideally, the "You have a negative balance!" popup should be:
Large
Red
not covering how much you owe!
I'd suggest something like, if >$5 owed, have a large popup covering the left side of the screen (so that you can still see items being scanned) that goes away after like 5 seconds or something.
Ideally, the "You have a negative balance!" popup should be:
I'd suggest something like, if >$5 owed, have a large popup covering the left side of the screen (so that you can still see items being scanned) that goes away after like 5 seconds or something.