Android IAP verification serverside

Google deprecated the API section in the Dev Play Console and i cannot get the new cloud API to work

php serverside looks like this
using https://github.com/googleapis/google-api-php-client

putenv('GOOGLE_APPLICATION_CREDENTIALS='.__DIR__.'/credentials.json');
    $client = new Google_Client();
    $client->useApplicationDefaultCredentials();
    $client->addScope('https://androidpublisher.googleapis.com');
    $service = new Google_Service_AndroidPublisher($client);
    $purchase = $service->purchases_products->get("com.test.app", "premium", $receipt);

i created an service account and activated the Google Play Android Developer API with the same account i have access to the Dev Play Console

Did you face the same issue? Please help, i also coudnt find any recent tutorial, all the ones i found still have the API section in the Dev Play Console.

this was the most recent tutorial i could find https://medium.com/@msasikanth/google-play-iap-verification-using-cloud-functions-bd8c3a22f9b9 which is already outdated, under “grant access” there are only Roles i can grant, one of them is “Finacial Services Admin” and none seems app or google play related

official doc is here https://developers.google.com/android-publisher/getting_started cant do step 5 because i either dont know where to find it or it was removed (more likely)

I suspect that the Roles are key but i have no clue which and i dont find any good tutorial/documentation