Techie Help Mobile Phone Passwords

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I am working on a new site. It will offer audio mp3 downloads. I want to offer customers the ability to pay by mobile phone billing. Eg the send a text (which costs them a set amount) and they then receive a password back so that they can access the file. I have had a look at mpush web site but I am put off by the fact that a lot of the clickable examples on the web site don't work (and that doesn't fill me with confidence - if they can't maintain there own web site).

Keen to find out if anybody is sing such a system and if so can they provide me with a link etc.

Thanks

ps I only have basic web building knowledge so I am looking for a solution that is a cut a paste of code.