I have CredentialProvider and GoogleProvider in my project. Whenever the user authenticates with GoogleProvider I want to create a random username and password in profile callback:

        profile(profile) {
          console.log(profile)
          const name = profile.given_name + ' ' + profile.family_name
          return {
            id: profile.id,
            email: profile.email,
            image: profile.picture,
            name,
            username: randomUsername(),
            password: randomEncPass(),
          }

     }

I want to know if profile callback is only called once when the user first uses it to login or it's always called whenever the user authenticates via Google? In later case, I would end up with random usernames on every authentication.