Settings → Plan & billing now has an Update payment method button, so you can switch what your plan renews on without contacting us. You can use a card or, in India, UPI.
If a renewal fails, you'll see it on that page and get an email. Update your payment method, we charge what's due, and your plan comes back once it clears. UPI and Indian cards can take up to 3 days.
Changed your mind after cancelling? Keep my plan undoes it any time before your billing period ends.