Trials and Subscription Lifecycle

Implement trial activation, expiration, and trial-to-paid conversion while preventing an unconfirmed payment from activating paid access.

Implement a subscription-change command that uses provider quotes for immediate upgrades or seat increases, schedules downgrades or seat decreases for the next period, and rejects quantities below assigned seats.

Implement immediate and end-of-period cancellation, including reversal of a pending cancellation when the provider supports it.

Apply successful renewal events idempotently so the local billing period advances exactly once.

Apply failed-payment and recovery events using provider-managed dunning status plus configurable local grace-period and access-suspension policies.