Are several small purchases combined to get 1 chance?

Yes, receipts are combined. To receive 1 chance, the total amount of purchases made with the credit card must be at least 2 000 rubles. This means that you can spend 1 000 rubles at the supermarket, then the next day fill up your car for another 1 000 rubles and receive 1 chance for the 2 000 rubles spent.