controller::get_token

//Get client_secret.json:
//https://github.com/googleapis/google-api-php-client/blob/main/docs/oauth-web.md#create-authorization-credentials
//https://console.developers.google.com/apis/credentials
//URI redirect: http://127.0.0.1:8000
//Note: It may take 5 minutes to a few hours for settings to take effect

    $dir = __DIR__ . "/../../../client_secret.json"; /* ../Project/client_secret.json */

    $client = new \Google_Client(); //composer require google/apiclient
    $client->setAuthConfig($dir);
    $client->setRedirectUri('http://127.0.0.1:8000'); /* http://127.0.0.1:8000 not http://localhost:8000 */
    $client->addScope('https://www.googleapis.com/auth/cloud-platform');
    $client->setAccessType('offline');
    $client->setIncludeGrantedScopes(true);
    $client->setPrompt('consent');

    if (isset($_GET['code'])) { //when redirect
        $client->authenticate($_GET['code']);
        $token = $client->getAccessToken();
        $access_token = $token['access_token'];
        dd($access_token, $client);
    }

    $auth_url = $client->createAuthUrl();
    header('Location: ' . filter_var($auth_url, FILTER_SANITIZE_URL));
    exit;

controller::firebase_remote_config

    // ----- get list remote config
    $access_token = '';
    $project_id = '';

    $curl = curl_init();
    $header[] = "Content-Type: application/json";
    $header[] = "Authorization: Bearer " . $access_token;
    $URL = "https://firebaseremoteconfig.googleapis.com/v1/projects/$project_id/remoteConfig";

    curl_setopt($curl, CURLOPT_URL, $URL);
    curl_setopt($curl, CURLOPT_HTTPHEADER, $header);
    curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "GET");
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    $response = curl_exec($curl);
    curl_close($curl);

    $response = json_decode($response, true);

    dd($response);