This might be silly but it would be cool to send Gift codes that you can redeem at "Tetrio support" section. That way you can just give them the code instead of going through the payment process every single time.
You should be able to customize each code for what they can give and how many of them you will buy in total.
The codes should be sent to the E-mail address for protection, or at least separated from the main game.
Just an idea that popped up for me. No need to take this post seriously unless it catches your interest.
