The concept

Recurring billing is the automatic, repeated charge made on a credit card to keep a subscription or plan active, without the buyer having to manually authorize each new payment cycle.

In international sales, recurring billing requires extra attention to the approval rate: issuing banks in other countries may decline a recurring charge more often than the first charge, which makes smart retry relevant for keeping subscriptions active.

How it shows up in practice

You have a monthly course subscription. Each month the platform automatically charges the student's card, without asking them to type the details again, without asking for authorization again. If all goes well, the charge goes through and the student stays enrolled. The problem is that issuing banks in other countries sometimes refuse recurring charges more often than the first charge, because there are rules and consumer protections that block repeated charges.

The only asset that can be protected from virtually any threat and increase in value year after year is the relationship you have with your customers.

Dan Kennedy Source: No B.S. Ruthless Management of People and Profits.

If the charge the next month fails, you need to try again, maybe with a different processing route. That is why smart retry is important for international subscriptions: a refusal that looked final sometimes is just a routing detail that a second attempt can resolve.