I have a paid Android app that costs some $. I would like to make it free for a certain period of time. I.e. a promotional price of $0. In Google Play, there is an option to make an app free but when I check it, it says:
"Setting the price to Free is permanent; you cannot change to a price later."
That's certainly not what I want! After a week I want to set my original price back! So...
Q: How can I have a promotional price of $0 during, lets say, a week?