Récupérer la liste de mes abonnements YouTube (API)

Bonjour,

En utilisant les API Google, j'aurais aimé récupérer la liste des chaînes auxquelles je suis abonné depuis mon compte Youtube. Pour cela, j'ai utilisé la bibliothèque PHP suivante: https://packagist.org/packages/league/oauth2-client. Après avoir appliqué toutes les informations nécessaires, j'obtiens l'erreur suivante: Uncaught UnexpectedValueException: Invalid response received from Authorization Server. Expected JSON.

Voici mon code:

<?php

require 'vendor/autoload.php';

$provider = new \League\OAuth2\Client\Provider\GenericProvider([
    'clientId'                => 'my_oauth_client_id',    // The client ID assigned to you by the provider
    'clientSecret'            => 'my_oauth_client_secret',   // The client password assigned to you by the provider
    'redirectUri'             => 'http://localhost/oauthytb/index.php',
    'urlAuthorize'            => 'https://accounts.google.com/o/oauth2/v2/auth',
    'urlAccessToken'          => 'https://oauth2.googleapis.com/token',
    'urlResourceOwnerDetails' => 'https://www.googleapis.com/auth/youtube.readonly'
]);

// If we don't have an authorization code then get one
if (!isset($_GET['code'])) {
    $options = [
        'scope' => ['https://www.googleapis.com/auth/youtube.readonly']
    ];

    // Fetch the authorization URL from the provider; this returns the
    // urlAuthorize option and generates and applies any necessary parameters
    // (e.g. state).
    $authorizationUrl = $provider->getAuthorizationUrl($options);

    // Get the state generated for you and store it to the session.
    $_SESSION['oauth2state'] = $provider->getState();

    // Redirect the user to the authorization URL.
    header('Location: ' . $authorizationUrl);
    exit;

// Check given state against previously stored one to mitigate CSRF attack
} elseif (empty($_GET['state']) || (isset($_SESSION['oauth2state']) && $_GET['state'] !== $_SESSION['oauth2state'])) {

    if (isset($_SESSION['oauth2state'])) {
        unset($_SESSION['oauth2state']);
    }

    exit('Invalid state');

} else {

    try {

        // Try to get an access token using the authorization code grant.
        $accessToken = $provider->getAccessToken('authorization_code', [
            'code' => $_GET['code']
        ]);

        // We have an access token, which we may use in authenticated
        // requests against the service provider's API.
        echo 'Access Token: ' . $accessToken->getToken() . "<br>";
        echo 'Refresh Token: ' . $accessToken->getRefreshToken() . "<br>";
        echo 'Expired in: ' . $accessToken->getExpires() . "<br>";
        echo 'Already expired? ' . ($accessToken->hasExpired() ? 'expired' : 'not expired') . "<br>";

        // Using the access token, we may look up details about the
        // resource owner.
        $resourceOwner = $provider->getResourceOwner($accessToken);

        var_export($resourceOwner->toArray());

        // The provider provides a way to get an authenticated API request for
        // the service, using the access token; it returns an object conforming
        // to Psr\Http\Message\RequestInterface.
        $request = $provider->getAuthenticatedRequest(
            'GET',
            'https://www.googleapis.com/youtube/v3/subscriptions',
            $accessToken
        );

    } catch (\League\OAuth2\Client\Provider\Exception\IdentityProviderException $e) {

        // Failed to get the access token or user details.
        exit($e->getMessage());

    }

}

?>

Merci d'avance pour votre aide.
Quentin