iOS | Event listener or Observer to get any changes on the current subscription status

Hi,

Does Qonversion have any event listerner or observer for me to use in order to get any changes on the current subscription status such as cancellation.? From my understanding, we only get the expired date once we call checkPermissions(). I don't think it good practice for me keep calling checkPermissions() for a certain interval time (let say for every 5 minutes) for just to get the latest permission status data.

Appreciate if anyone can advice me on this.

Thank you. ^_^