I purchased the Infuse 2 app awhile ago but removed it from my iPod Touch 5 because I ran out of space on my iPod. However, I just redownloaded it because I will be getting a Seagate Wireless Plus external hardrive on which I will store all my movies for streaming. After reinstalling the Infuse 2 app, I am offered an in-app purchase for Infuse Pro for $6.99. Everytime I try to purchase Infuse Pro, it asks me to enter my iTunes password but gives me an error saying I have either entered the wrong iTunes username or password. I know for a fact I am entering the correct iTunes username and password because the same credentials work properly for everything else on my iPod.
Why does the Infuse Pro in-app purchase keep insisting that I have entered the wrong password?