AdamWathan\EloquentOAuth\Authenticator::addProviderIdentity PHP Method

    protected function addProviderIdentity($user, $providerAlias, $details)
    {
        $identity = new OAuthIdentity();
        $identity->user_id = $user->getKey();
        $identity->provider = $providerAlias;
        $identity->provider_user_id = $details->id;
        $identity->access_token = $details->access_token;
        $this->identities->store($identity);
    }