I don't know even a little bit about remove ads and how it works.Can someone please tell me how to use remove ads and add remove ads in my game and how can I get the id for store identifier.Please,help me.(please with screenshots.that way I can understand well).Thanks.
well I dont have much experience but i think you will have to create and upload two packages one with ads and one without ads on play store. the one without ads can be bought then. as I am sure that you cannot go from free to paid or vice-versa in play store.
https://www.buildbox.com/forum/index.php?threads/removed-ads-need-help.227/ There has already been a post and answers on how to do this.