Hi,
I am using google ads api to get adwords data, but I got an error when I
execute the code.
```
$oAuth2Credential = (new
OAuth2TokenBuilder())->fromFile("google_ads_php.ini")->build();
// OAuth2 credentials above.
$googleAdsClient = (new
GoogleAdsClientBuilder())->fromFile("google_ads_php.ini")
->withOAuth2Credential($oAuth2Credential)
->build();
$googleAdsServiceClient = $googleAdsClient->getGoogleAdsServiceClient();
$customerServiceClient = $googleAdsClient->getCustomerServiceClient();
// Issues a request for listing all accessible customers.
$accessibleCustomers = $customerServiceClient->listAccessibleCustomers();
print 'Total results: ' . count($accessibleCustomers->getResourceNames()) .
PHP_EOL;
```
Error:
```
{ "message": "Request is missing required authentication credential.
Expected OAuth 2 access token, login cookie or other valid authentication
credential. See
https:\/\/developers.google.com\/identity\/sign-in\/web\/devconsole-project.",
"code": 16, "status": "UNAUTHENTICATED", "details": [ { "@type":
"google.ads.googleads.v6.errors.googleadsfailure-bin", "data": "<Unknown
Binary Data>" }, { "@type": "grpc-status-details-bin", "data": "<Unknown
Binary Data>" }, { "@type": "request-id", "data": "feAcN0Pr2ap5iWrpDaC-rA"
} ] }
```
After learning, someone said that it could be the wrong refresh token, but
I can use the refresh token to refresh access token.
How can I solve it?
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