First notice
EmailSubject: Your payment for [Product] didn't go through
Hi [Customer name],
We tried to charge your card ending in [last 4 digits] for your [plan name] subscription on [date], but the payment was declined. This usually happens when a card has expired or the bank flagged the charge.
Your account is working as normal for now. To update your payment method, go to [billing page link]. It takes about a minute.
If you think the card should have worked, it's worth checking with your bank; they can see why it was declined, and we can't.
[Agent name]