(I tried to send this as email but I did it from the wrong address.)
I think if you separate the total from the value / amount for items this becomes clearer. The negative amount applies to items within the collection of things being charged, not to the overall transaction. Or at least that is what I think should happen. The total cannot be negative. That makes no sense. But individual items can act as a discount.
NOTE: I know that in accounting you can have a negative amount that acts as a credit memo. But this isn't a payment scheme for accountants. We are not trying to handle refunds (at least not at this stage, and not as payments).
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