Unable to restore Plus purchase on my new phone – Dexter Price Alert for Amazon Review

Why doesn’t the restore purchase work? I just bought a new iPhone, but discovered I need to pay again to get Plus, since restore purchase doesn’t work. I tried contacting the developer through the provided support link, but haven’t received a response in a week. I normally don’t like to post 1-star reviews, but I’m hoping this gets his attention and he responds to me or fixes the app in order to give everyone a solution.
Review by Chris Burnham on Dexter Price Alert for Amazon.