Android In app purchase error


I am getting the following error while trying to test Android in-app purchase with my test account.

Authentication is required. You need to sign in to your google account.

I have tried different ways by deleting the play store account, uninstalling updates of google play store app, clearing data of play store app, but it didn’t work. I am new to Android and ionic.Please suggest me a fix.
Your help is much appreciated.
Thanks in Advance

Could Anyone please share this answer??

Can we test In-app-purchase without publishing the app in Android??

This is a question better suited for plugin developer.

Yeah, thanks. @Gajotres