add in-app billing for free adroid app

**i will only consider programmers experienced in android market billing mechanism implementation!** i need to create a paid version of a free android app, using google's latest in-app billing. (this is the app: [login to view URL]) programmer must follow these guidelines: [login to view URL] programmer is responsible for the solution end-to-end, integrating it, along with all required security and authentication measures in our app, as suggested by the android guide. the programmer, in addition to the billing mechanism will have to take care of 1)purchase dialog box 2)invitation to buy(when credits/time expire or when a button is clicked) 3) different behavior for the app when paid and when not this is simple 1-3 dialog box addition to our app + some logic the app operates as follows: when downloaded for free from the market - it allows free server access for two weeks. after these two weeks, only one access per day, and on the second access each day will display the dialog box with purchase options. user can then purchase access to 1 month, 1 year or 20 access credits. programmer will have to manage this. the application is a bi-directional content delivery app, so we can use our server for authentication, as suggested by the manual and as required. ** **