see google just like fb will e-Mandate this and every 5000rs it will debit as per the threshold it reaches, so just add some other expensive on Magnus like grocery, amazon and you should be good to go, I don't have Magnus but I do have added card in FB and every month I change which will be billed cause every card is active and e-Mandate is there so there aren't too many transactions on one card and plus help in 40-52 days extra.