App\Http\Controllers\AccountApiController::register PHP Method

    public function register(RegisterRequest $request)
    {
        $account = $this->accountRepo->create($request->first_name, $request->last_name, $request->email, $request->password);
        $user = $account->users()->first();
        Auth::login($user, true);
        event(new UserSignedUp());
        return $this->processLogin($request);
    }