Having had credit cards compromised and replace three times in the last year it occurs to me that there might be some value in having a list of vendors where card details have to be updated for automatic/periodic payments. Perhaps in Reminders, there could be a group/split capability for this rather than maintaining a separate reminder for each of the candidates?

Each entry might have fields for the vendor|day-of-month-for-transaction|URL-to-make-it-happen. It would be even nicer for exercise of the reminder to insert a register comment (which would not be a bad addition either) in each affected account