Purchase in app [closed]

It'开发者_JS百科;s difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 10 years ago.

I am a new one for Android development. I am wondering about how to purchase in app. How to begin this feature ? Is there a documentation or API doc?

Thanks in advance.

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Have a look at the Android development website.