Upload video to YouTube with PHP asks verification code

Am building an API and need to have a method that allows uploading videos to YouTube.

The front end is handled by someone else, but PHP looks like this from what I could google:

require_once __DIR__ . '/vendor/autoload.php';$client = new Google_Client();$client->setApplicationName('API code samples');$client->setScopes(['https://www.googleapis.com/auth/youtube.upload',]);$client->setAuthConfig('client_secret.json');$client->setAccessType('offline');// Request authorization from the user.$authUrl = $client->createAuthUrl();printf("Open this link in your browser:\n%s\n", $authUrl);print('Enter verification code: ');$authCode = trim(fgets(STDIN));// Exchange authorization code for an access token.$accessToken = $client->fetchAccessTokenWithAuthCode($authCode);$client->setAccessToken($accessToken);// Define service object for making API requests.$service = new Google_Service_YouTube($client);// Define the $video object, which will be uploaded as the request body.$video = new Google_Service_YouTube_Video();$response = $service->videos->insert('',  $video,  array('data' => file_get_contents("video.mov"),'mimeType' => 'application/octet-stream','uploadType' => 'multipart'  ));print_r($response);

Problem: This requires a verification code via the prompt which I don't even know where to get from.

Question: Hoping that someone has experience with this. How can I upload a video to YouTube using the API?

Note: The idea is to be able to have a script where I just pass the path to the video, title, description, have it uploaded, and get the response back.