In the place where I can check my Subscription, under Billing Details the first item is Billing Mode. In that line is a link to "Change Credit Card Details". When I click on it, of course that's all I can do.
It would be helpful if I could check what credit card I have with you. All you need to display is "X"'s for all the digits but show the last four, and expiry date. Nothing else. This would also help in case some fraudulent people send me spam mail to upgrade my credit card details with Zoho.
If I'm not sure which card I used with you guys, I have to make a change with you to be sure, perhaps unneccessary. Since you haven't sent me any messages, I'll also assume it's up to date.