公共 API 参考(@saas/contracts + @core/saas-kit + apps/api 对外接口)
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    Variable subscriptionStatusTransitionedPayloadSchemaConst

    subscriptionStatusTransitionedPayloadSchema: ZodObject<
        {
            actorId: ZodOptional<ZodString>;
            from: ZodUnion<
                readonly [
                    ZodEnum<
                        {
                            active: "active";
                            cancelled: "cancelled";
                            expired: "expired";
                            suspended: "suspended";
                        },
                    >,
                    ZodNull,
                ],
            >;
            reason: ZodOptional<ZodString>;
            to: ZodEnum<
                {
                    active: "active";
                    cancelled: "cancelled";
                    expired: "expired";
                    suspended: "suspended";
                },
            >;
        },
        $strict,
    > = ...

    subscription.status.transitioned v1 payload(from=迁移前态·空流起点为 null)。