If i use in app billing getting Purchase failed even

If i use in app billing inside the app, i am getting purchase failed. i also uploaded the app on Playstore but while i were going to create the in app product id playstore saying to add in app billing Permission. and if i add in app billing permission google saying update the in app billing to version 4.0.
what to do.
and also i am not able to reply on community.

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