you should learn to ask questions correctly… we have a guide for that here How to ask a question?
Your question is very vague… and depending on the circumstances the answers are different…
Therefore please elaborate… and: are you uploading your app to Google Play?
and as you also have been asking here recently [OUTDATED] [Free] InAppBilling V5.0.0 - Sell your digital product from your android application - #121 by Burak_bas let me guess you are using In App Billing? So why not asking the question in the corresponding thread? The In App Billing extension can give you the purchase history…
Taifun