We've added a new subscription.billing_month.ends_soon webhook event that allows integrated apps to be notified 1 hour before the billing month of a subscription to a paid plan ends.

The new event is sent every month for both monthly and annual subscriptions. For annual subscriptions the "billing month" is determined according to the subscription start date.

Developers can leverage this event to implement automatic smart upgrade flows based on customer usage, while ensuring that upgrades take place in a monthly cadence relative to the subscription start date.

More details about the new event and its payload can be found here.