In my WP7 application, I want to provide basic functionality as free (level 1). Then, to get the next level (2), the user must buy. I am familiar with the IsTrial () method, and I can use this for this purpose.
What happens if I want to sell the next level (level 3 and later level 4) for this user who has already acquired level 2 or level 3? How should I do it?
Pratik
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