Why I can't make a purchase in app, is it possible if i use vpn?

Hello! if you are a mobile legends gamer, check this awesome selena gameplay:

       I love gaming my whole life just about from my first system the intellvision all the way up to the ps2. But then came the Internet and gaming from what I had know all those single player games had gone and with it the originality those games had. As the internet Gameplay became more and more part of the gaming world it seem all the games that where coming out where multiplayer games where you compete for ranks and numbers. From that just came a world where games just began to feel all the same. 

love it, absolutely perfect. Now there is that’s not my neighbor for IPad and IOS