Authorization code grant with Socialite setup - laravel

Question

I'm trying to implement an Authorization code grant with Socialite. I'm able successfully to receive users in the callback, but struggling to set up the other part of auth. I've created the personal passport client and received the client ID & Secret in oauth_clients. Whenever I use the createToken() I am able to see oauth_access_tokens these tokens with the name of PKCE(which contains the same name as in oauth_client). The $code is taken from the query in the callback, however, the $response in the very end is null, any idea why?
public function callbackGoogle()
{
// Receive the user credentials from social
$googleUser = Socialite::driver('google')->stateless()->user();
// Get the user by email
$user = User::where('email', $googleUser->email)->first();
// Create token
$user->createToken('PKCE')->accessToken;
// Get query parameter code from callback
$code = request()->query()['code'];
// Get client data
$client = DB::table('oauth_clients')->where('name', 'PKCE')->first();
$response = Http::asForm()->post('http://localhost:5000/oauth/token', [
'grant_type' => 'authorization_code',
'client_id' => $client->id,
'client_secret' => $client->secret,
'code' => urldecode($code),
'redirect_uri' => $client->redirect,
]);
// // Receiving null
dd($response->json());
}

Answer 1

You are trying to exchange an access token from google with your own application.
This does not make sense.
With this line:
$googleUser = Socialite::driver('google')->stateless()->user();
You have already exchanged the code from the URL with a token from google.
If you want to get an API token for your API, you already did this with
$user->createToken('PKCE')->accessToken;
You could use
$token = $user->createToken('PKCE')->accessToken;