Roeshimi I don't think this can work for card payments, but it should be possible for payments with your phone.
I'm pretty sure this idea was already on Together but I can't find it now.
A more or less same idea is that you can connect a store to an account. A bit like how the MasterCard rerouting used to work but then for physical stores.
Perhaps some day when a IFTTT system is available we could make these rules ourselves. If transaction name contains "Aldi" then use Groceries account and things like that.