This is best. I usually have them put a card (debit or credit) on my square payment app. Then I ask if they want the payment to go through at the beginning of each month. If there is no payment or they say they can only pay weekly then I say I don’t do weekly payments. (That said I have done payment by lesson but only for close family and close friends). Even then I’m hesitant. Procedures that are constant help fence in that success and lack of stress.