subscriptionDuration property
Description: Used to set the duration of this subscription.
Use cases: This field is required.
Value range: ：1 to 43200 (30 days), and the unit is minute.
Caution: After the subscription is expired, the subscribed user will be deleted from the subscription list, and the status changes of the user will not be synchronized to the subscriber.
Implementation
int subscriptionDuration = 0;