The module uses the subscription’s start date, next invoice date, and the plan’s days to end / renewal limit. Based on these values, it calculates a renew date (used for alerts), an end date, and a close date. If the subscription reaches its end date and the plan is not set to manual renewal, the subscription is automatically closed.

On the next invoice date, the module can automatically create an invoice (draft or posted, depending on the plan’s invoice mode), update renewal-related flags, recalculate the next renewal/close dates, and trigger renewal alert emails. This ensures recurring billing continues without manual intervention.

The renewal process is triggered based on the calculated renew date, which is derived from the subscription’s start date and plan configuration. When the renew date is reached, the system sends a renewal alert to notify users.