Best way to make teens twitter user pay ?

Hey,

I'm selling a product on twitter to teens mostly. Right now, they just connect to an app with Twitter which gets me followers. Seeing the conversion rate I get (>70%), I'm thinking making them pay for extra features. The only thing is that I don't think the best way is to make them pay via Paypal. I think the best way would be a service like AlloPass, Content Lock, App Wall etc... Does anyone know a good service to do so ?

Best,

IMO its pretty hard to sell on twitter. Conversions are super low and no one really buys. You should try some other social media sites beside twitter.