google api - Get android subscription status, failed with 403

Question

While trying to get android in-app subscription status (with expiry date), I get the following error message:

{
 "error": {
  "errors": [
   {
    "domain": "androidpublisher",
    "reason": "projectNotLinked",
    "message": "The project id used to call the Google Play Developer API has not been linked in the Google Play Developer Console."
   }
  ],
  "code": 403,
  "message": "The project id used to call the Google Play Developer API has not been linked in the Google Play Developer Console."
 }
}

The URL is: https://www.googleapis.com/androidpublisher/v2/applications/[packageName]/inapp/[productId]/purchases/[purchase_token]?access_token=[access_token]

It says the project id is not linked. I have done the following:

1. Create the project in Google Developer Console.
2. Turn on the Google Android Publisher API.
3. Link the project ID as mentioned in API access page (https://developers.google.com/android-publisher/getting_started)
4. Fill in the packageName, productId (from in app-purchase), purchase_token (from Android app)

Not sure why the error message appear as above. I have tried with the OAuth2 playground with no luck (https://developers.google.com/oauthplayground/)

Answer 1

I spent some time on this but at the end the error message says all: "[...] has not been linked in the Google Play Developer Console".

I spent hours looking in the Google Developer Console, but the place where to link the project is in the Google Play Developer console.

Just go to Settings -> Api Access and you'll be able to link the project you created in the Google Developer Console.

Here is a working PHP solution to get the subscription status. You need to create a service account in the Google Developer Console -> 'your project' -> API & Auth -> Credential and download the Google API PHP Client from https://github.com/google/google-api-php-client

    set_include_path("../src/" . PATH_SEPARATOR . get_include_path());
    require_once 'Google/Client.php';
    require_once 'Google/Service/AndroidPublisher.php';

    $client_id = '';    //Your client id
    $service_account_name = '';  //Your service account email
    $key_file_location = ''; //Your p12 file (key.p12)

    $client = new Google_Client();
    $client->setApplicationName(""); //This is the name of the linked application
    $service = new Google_Service_AndroidPublisher($client);

    $key = file_get_contents($key_file_location);
    $cred = new Google_Auth_AssertionCredentials(
        $service_account_name,
        array('https://www.googleapis.com/auth/androidpublisher'),
        $key
    );
    $client->setAssertionCredentials($cred);
    if($client->getAuth()->isAccessTokenExpired()) {
      $client->getAuth()->refreshTokenWithAssertion($cred);
    }        
    $apiKey = ""; //Your API key
    $client->setDeveloperKey($apiKey);

    $package_name = ""; //Your package name (com.example...)
    $subscriptionId = "";   //SKU of your subscription item

    //Token returned to the app after the purchase
    $token = "";

    $service = new Google_Service_AndroidPublisher($client);
    $results = $service->purchases_subscriptions->get($package_name,$subscriptionId,$token,array());

    print_r ($results); //This object has all the data about the subscription
    echo "expiration: " . $results->expiryTimeMillis;
    exit;