Paid for the app keeps wanting me to pay again – ShiftLife Organizer Review

Use to like this app, won’t work now. When i try to add an event to my calendar, it says I need to pay. I’ve already bought the app and it keeps saying I need to buy the full version which I’ve already done. Restore previous purchase doesn’t work either.
Review by Caroljim1985 on ShiftLife Organizer.