Google Play Store reviews API in PHP - php

Question

Currently I am trying to get reviews from https://play.google.com/store/apps/details?id=com.rosterelf.android.phone&hl=en by following https://developers.google.com/android-publisher/api-ref/rest/v3/reviews/list documentation.
I am using the PHP (cURL) method but I am keep getting an error saying --- Request is missing required authentication credential. Expected OAuth 2 access token, login cookie or other valid authentication credential.
Below are my steps what I have done / tried so far.
Created one Api KEY, OAuth 2.0 Client ID and Service Account in Google Developer Console.
Enabled the Google Play Android Developer API and Google Play Custom App Publishing API too.
Going at my browser https://accounts.google.com/o/oauth2/auth?scope=https://www.googleapis.com/auth/androidpublisher&response_type=code&redirect_uri=REDIRECT-URI&client_id=CLIENT-ID
It gives me the code in response and then to be able to get access_token, I am using below PHP cURL code which is also working fine.
<?php
$client_id = 'CLIENT-ID';
$redirect_uri = 'REDIRECT-URL';
$client_secret = 'CLIENT-SECRET';
$code = 'CODE';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "https://accounts.google.com/o/oauth2/token");
curl_setopt($ch, CURLOPT_POST, TRUE);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_POSTFIELDS, array(
'code' => $code,
'client_id' => $client_id,
'client_secret' => $client_secret,
'redirect_uri' => $redirect_uri,
'grant_type' => 'authorization_code'
));
$data = curl_exec($ch);
var_dump($data);
exit;
And in response, I am successfully able to get the access_token.
Now I am trying to go directly to this page in browser https://www.googleapis.com/androidpublisher/v3/applications/com.rosterelf.android.phone/reviews?access_token=ACCESS-TOKEN but it keeps saying me...
Request had invalid authentication credentials. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project
-> I have checked the roles and permissions and it has owner as a permission in service account.
-> My REDIRECT-URI also the same URL throughout this process.
I event tried this URL to fetch the reviews https://androidpublisher.googleapis.com/androidpublisher/v3/applications/com.rosterelf.android.phone/reviews/review?access_token=ACCESS-TOKEN but having the same error.
Can someone please guide me what am I missing from here and why I am getting here and what exactly I should do from here on to get the reviews ?
Any help or suggestions will be highly appreciated.
Thanks in advance.

Answer 1

This is an example for that API using the official client library. I believe this code is for service account authentication. The service account will need to be properly configured see using_a_service_account How to create service account credetinals just remember to enable the proper library.
<?php
require_once 'google-api-php-client-2.2.2\vendor\autoload.php';
putenv('GOOGLE_APPLICATION_CREDENTIALS=client_secret.json');
$client = new Google_Client();
$client->useApplicationDefaultCredentials();
$client->addScope(Google_Service_AndroidPublisher::ANDROIDPUBLISHER);
$android_publisher = new Google_Service_AndroidPublisher($client);
$response = $android_publisher->reviews->listReviews('appname');
echo "<pre>";
var_dump($response);