Default payment methods, part B

Almost a month ago to the day, I wrote about this ritual I have to perform each time I make an appointment with this specific clinic. It went like this: I add a card to their web portal, and set it as my “default” payment method for all new appointments. I make an appointment. I get an email asking me to confirm my payment method, otherwise the appointment is cancelled. I log back into their system, select the “default” card as my payment method, and it works. Repeat steps 2-4 for e...