Core/src/RequestWrapper.php
private function fetchCredentials()
    {
        $backoff = new ExponentialBackoff($this->retries, $this->getRetryFunction());

        try {
            return $backoff->execute(
                [$this->getCredentialsFetcher(), 'fetchAuthToken'],
                [$this->authHttpHandler]
            );
        } catch (\Exception $ex) {
            throw $this->convertToGoogleException($ex);
        }
    }
private function fetchCredentials()
    {
        $backoff = new ExponentialBackoff($this->retries, $this->getRetryFunction());

        try {
            return $backoff->execute(
                [$this->getCredentialsFetcher(), 'fetchAuthToken'],
                [$this->authHttpHandler]
            );
        } catch (\Exception $ex) {
            throw $this->convertToGoogleException($ex);
        }
    }
private function fetchCredentials ( ) { $ backoff = new ExponentialBackoff ( $ this -> retries , $ this -> getRetryFunction ( ) ) ; try { return $ backoff -> execute ( [ $ this -> getCredentialsFetcher ( ) , 'fetchAuthToken' ] , [ $ this -> authHttpHandler ] ) ; } catch ( \ Exception $ ex ) { throw $ this -> convertToGoogleException ( $ ex ) ; } }
Fetches credentials.

@return array
Fetches credentials .