Shopper login with google/facebook from external app

I have an android app that show vtex ecommerce inside webview. Ecommerce Owner has activated Google and Facebook oauth integration but in Android app we authenticate through android or facebook SDK so we obtain google or Facebook access token.

The problem is that we don’t want shopper authenticate twice, first on android app and then on vtex inside android app. There’s and api or endpoint where we can sent google or android access token and signin shopper automatically in Vtext and create VtexIdclientAutCookie cookies ? Like a SSO with google or facebook. Or what’s the exactly workflow process we have to follow for do that ?