I have a complex case where we have to create subscriptions with phases for our customers, initially they must pay for a 12 month term and after this period we must start charging a monthly fee. This is easy to achieve with subscription schedules, but the problem we have is that part of the requirement is to allow them to pay the initial payment for the 12 months in multiple payments and with different cards, this creates multiple possibilities, for example a customer could say: I want to pay the 12 months in 3 payments within the first 30 days, in the first one I would pay half and in the other two 25% and 25%, and at the same time pay the first one with a card and the second ones with other cards, what would be the best way to attach those payments to the subscription? I think it is not possible to use the phases for the periods, but I would like to confirm with your help.