Purchase event messages might sometimes be unclear

[Esinko]

Purchase events show up as positive changes against the current account total, while returning a can (for example) show as negative changes to the account total.

I think some general cleanup for logging purchase events should be done too.

I think it would make more sense for buying a coffee to log:
Bought 1x Coffee 0.19e
Instead of:
Bought 1x Coffee 0.19e (Total 0.19e)

And when returning a can to log:
Returned 1x Can return 0.15e
Instead of:
Bought 1x Can return -0.15e (Total -0.15e)

Perhaps even more specific messages should be made?

[Osku9]

Do you wanna give some explanation of why you think that the can return sum being positive would be somehow more clear?

The total: I have to check how it works today. If it counts all the purchases made during a particular login, then it makes sense, though not really that necessary. If not, then it’s just useless, because it’s just repeating the price.
Ohhhh wait is there an option to buy multiple of one product. There might be. Yeah maybe then it can make sense anyway. But if possible, it would be neater if the total only showed up when actually buying multiple at a time.

[Esinko]

Just like in the registers at stores (in Finland at least) the screen say "Palautus" or "Takaisin" and the positive sum that was returned to the customer's card or directly to them as cash. We should follow this common practice as people are already familiar with it.