php google ads api - unauthorized_client - php

Question

I'm using 'Google_Client' class to authenticate access to adwords api so:
$REDIRECT_URI = 'http://localhost/GoogleAdwords/auth.php';
$client = new Google_Client();
$client->setApplicationName("App name");
$SCOPES = array('https://www.googleapis.com/auth/adwords'
);
$client->setIncludeGrantedScopes(true);
$client->setAccessType('offline');
$client->setRedirectUri($REDIRECT_URI);
$client->setScopes($SCOPES);
try{
$oauth2 = (new OAuth2TokenBuilder())
->withClientId($OAuthCredentials['clientId'])
->withClientSecret($OAuthCredentials['clientSecret'])
->withRefreshToken($client->getRefreshToken())
->build();
}catch(Exception $err){
//redirect("auth.php");
echo $err;
}
After authentication:
$oauth2 = (new OAuth2TokenBuilder())
->withClientId($OAuthCredentials['clientId'])
->withClientSecret($OAuthCredentials['clientSecret'])
->withRefreshToken($client->getRefreshToken())
->build();
$session = (new AdWordsSessionBuilder())
->fromFile()
->withOAuth2Credential($oauth2)
->build();
$adWordsServices = new AdWordsServices();
$managedCustomerService = $adWordsServices->get($session, ManagedCustomerService::class);
$selector = new Selector();
$selector->setFields(['CustomerId', 'Name']);
$selector->setOrdering([new OrderBy('CustomerId')]);
try{
$mccAccounts = $managedCustomerService->get($selector);
}catch(Exchange $e){
// echo $e->getMessage();
}
I'm pretty sure that the client is authenticated as I can get refreshToken and access token. But I'm getting this error:
Client error: `POST https://www.googleapis.com/oauth2/v4/token` resulted in a `401 Unauthorized` response: { "error": "unauthorized_client", "error_description": "Unauthorized" }
What could be the problem here? Am I missing something?
EDIT:
Using the same $client to access user information and shopping content works fine, but that's not the case for adwords.

Answer 1

This works for me, but I don't understand Google's libraries well enough to say if it's all necessary, maybe someone else can trim the fat.
$client = new \Google_Client();
$client->setApplicationName('NAME_HERE');
$client->setAuthConfig(__DIR__ . '/../Credentials/oauth.json');
$client->setAccessType('offline');
$client->setApiFormatV2(2);
//// Load previously authorized credentials from a file.
$oAuth = json_decode(file_get_contents(__DIR__ . '/../Credentials/oauth.json'), true);
$accessToken = json_decode(file_get_contents(__DIR__ . '/../Credentials/token.json'), true);
$client->setAccessToken($accessToken);
$oauth2 = (new OAuth2TokenBuilder())
->withClientId($oAuth['installed']['client_id'])
->withClientSecret($oAuth['installed']['client_secret'])
->withRefreshToken($client->getRefreshToken())
->build();
$session = (new AdWordsSessionBuilder())
->withDeveloperToken('TOKEN_HERE')
->withClientCustomerId("CUSTOMER_ID_HERE")
->withOAuth2Credential($oauth2)
->build();
$adWordsServices = new AdWordsServices();
$managedCustomerService = $adWordsServices->get($session, ManagedCustomerService::class);
$selector = new Selector();
$selector->setFields(['CustomerId', 'Name']);
$selector->setOrdering([new OrderBy('CustomerId')]);
$mccAccounts = $managedCustomerService->get($selector);
dd($mccAccounts) ;