If you aren't enabling verification codes then you should simple message the user and explain. It's deceptive to refuse to deliver what you promised to provide, then drop the ball on the user forcing them to upgrade. That not the way to do business. That's bully tactics. Don't mind paying your fee but see no way to do so in your app. I won't recommend your app under the current circumstances I may have to uninstall if issue persist. Please help and offer a solution. Thanks you.