how to signup new user after signing in with google -- custom backend (email,password)

[mhdalmajid]

I have a custom backend that uses email and password for auth and Token bearer
I'm using google provider just to get profile details.
so the steps (correct me if I'm wrong) are.

• sign-in with google provider
• get profile details :
• check if a new user
• send the new user details to sign-up the user

where to check and do steps 2,3,4?
if there is an example Repo that will be good.

I think that I can do it in a sign-in callback, but not sure if this good way .