In-App Billing Query

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http://androidforums.com РHello, Has anyone had experience with In-App billing? I have tried to understand how to implement it but its just confused me so much!! Basically I am in the process of making an app which is used to advertise other developers apps on the play store, to do this there is a little fee which the developer would pay for me to host their app on mine. What i am after is to have a button at the bottom of the app which when clicked allows the user to make a one time payment of £2. At the moment that will be it and I will then add their app to mine the same day, in the future i will be making it (General)