Authentication with Google Analytics API request PHP

I have followed this turotial to integrate Google Analytics Data API (GA4) in my application.

This is the sample code the authentication tutorial provides: (contains 3 ways of authenticating)

require 'vendor/autoload.php';

use Google\Cloud\Storage\StorageClient;

// Authenticating with keyfile data.
$storage = new StorageClient([
    'keyFile' => json_decode(file_get_contents('/path/to/keyfile.json'), true)
]);

// Authenticating with a keyfile path.
$storage = new StorageClient([
    'keyFilePath' => '/path/to/keyfile.json'
]);

// Providing the Google Cloud project ID.
$storage = new StorageClient([
    'projectId' => 'myProject'
]);

Then there is this sample code for making request to the API:

require 'vendor/autoload.php';

use Google\Analytics\Data\V1beta\BetaAnalyticsDataClient;
use Google\Analytics\Data\V1beta\DateRange;
use Google\Analytics\Data\V1beta\Dimension;
use Google\Analytics\Data\V1beta\Metric;

/**
 * TODO(developer): Replace this variable with your Google Analytics 4
 *   property ID before running the sample.
 */
$property_id = 'YOUR-GA4-PROPERTY-ID';

// Using a default constructor instructs the client to use the credentials
// specified in GOOGLE_APPLICATION_CREDENTIALS environment variable.
$client = new BetaAnalyticsDataClient();

// Make an API call.
$response = $client->runReport([
    'property' => 'properties/' . $property_id,
    'dateRanges' => [
        new DateRange([
            'start_date' => '2020-03-31',
            'end_date' => 'today',
        ]),
    ],
    'dimensions' => [new Dimension(
        [
            'name' => 'city',
        ]
    ),
    ],
    'metrics' => [new Metric(
        [
            'name' => 'activeUsers',
        ]
    )
    ]
]);

// Print results of an API call.
print 'Report result: ' . PHP_EOL;

foreach ($response->getRows() as $row) {
    print $row->getDimensionValues()[0]->getValue()
        . ' ' . $row->getMetricValues()[0]->getValue() . PHP_EOL;
}

I am using CodeIgniter 4 and this is my code:

public function __construct(ConnectionInterface &$db = null, ValidationInterface $validation = null) {
    parent::__construct($db, $validation);

    $config = [
        'projectId'   => 'XXX',
        'keyFilePath' => 'path',
    ];
    new StorageClient($config);
}

public function apiRequest() {
    $property_id = 'xxx';

    // Using a default constructor instructs the client to use the credentials
    // specified in GOOGLE_APPLICATION_CREDENTIALS environment variable.
    $client = new BetaAnalyticsDataClient();

    // Make an API call.
    $response = $client->runReport([
        'property' => 'properties/' . $property_id,
        'dateRanges' => [
            new DateRange([
                'start_date' => '2020-03-31',
                'end_date' => 'today',
            ]),
        ],
        'dimensions' => [new Dimension(
            [
                'name' => 'city',
            ]
        ),
        ],
        'metrics' => [new Metric(
            [
                'name' => 'activeUsers',
            ]
        )
        ]
    ]);

    // Print results of an API call.
    print 'Report result: ' . PHP_EOL;

    foreach ($response->getRows() as $row) {
        print $row->getDimensionValues()[0]->getValue()
            . ' ' . $row->getMetricValues()[0]->getValue() . PHP_EOL;
    }

}

This is the error I am getting:

CRITICAL - 2021-08-25 13:46:20 --> Could not construct ApplicationDefaultCredentials
#0 ...\vendor\google\gax\src\CredentialsWrapper.php(132): Google\ApiCore\CredentialsWrapper::buildApplicationDefaultCredentials(NULL, Object(Google\Auth\HttpHandler\Guzzle7HttpHandler), NULL, NULL, NULL, Array)
#1 ...\vendor\google\gax\src\GapicClientTrait.php(426): Google\ApiCore\CredentialsWrapper::build(Array)
#2 ...\vendor\google\gax\src\GapicClientTrait.php(403): Google\Analytics\Data\V1beta\Gapic\BetaAnalyticsDataGapicClient->createCredentialsWrapper(NULL, Array)
#3 ...\vendor\google\analytics-data\src\V1beta\Gapic\BetaAnalyticsDataGapicClient.php(290): Google\Analytics\Data\V1beta\Gapic\BetaAnalyticsDataGapicClient->setClientOptions(Array)
#4 ...\app\Models\AnalyticsModel.php(30): Google\Analytics\Data\V1beta\Gapic\BetaAnalyticsDataGapicClient->__construct()
#5 ...\app\Controllers\Admin.php(40): App\Models\AnalyticsModel->apiRequest()
#6 ...\vendor\codeigniter4\framework\system\CodeIgniter.php(928): App\Controllers\Admin->dashboard()
#7 ...\vendor\codeigniter4\framework\system\CodeIgniter.php(436): CodeIgniter\CodeIgniter->runController(Object(App\Controllers\Admin))
#8 ...\vendor\codeigniter4\framework\system\CodeIgniter.php(336): CodeIgniter\CodeIgniter->handleRequest(NULL, Object(Config\Cache), false)
#9 ...\public\index.php(37): CodeIgniter\CodeIgniter->run()
#10 ...\vendor\codeigniter4\framework\system\Commands\Server\rewrite.php(45): require_once('C:\\Users\\JolanG...')

What am I doing wrong?

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