Also I am thinking about payments. We are using the type, that we have one "purse", but someone may input more till the trip. So, of real expenses, some participants are in "plus" (like they overpaid for other person), and other are in "minus (they need to pay). So, the final balance shows a) how much are expenses for each person b) how much each person overpaid/still needs to pay. For example, The trip price is 3000, we already paid 1500, person x put 1200 to purse. As it is my purse, I paid the remaining amount. So, current balance is: me: -700, Person x: +200, Person y: -1000. Expenses are 1000 for each, remaining to pay amount is 1500, All payments are done from one purse without pointing who are borrowing this specific amount or smth else.
Now I do not see the way to do this... Maybe I did not find it?