YSK For subscriptions: if you have multiple debit cards stored on your phone for manual purchases ONLY, you will get charged the very next checking account if the first one is declined.
What it says in the title. If you're signed up for a subscription bought with one debit card, they will charge the other one if your first checking account has insufficient funds. EVEN IF you only intended on that second card for manual purchases. Why YSK: if you're low on funds and you get surprised with a random bill. #education