Usage tracking for a single document:

require('vendor/autoload.php');

use Emis\Http\Client;
use Emis\Document\Api\Proxy\Search;
use Emis\Document\Api\Proxy\Usage;

$client = new Client();
$client->setApi(Client::DOCUMENTS_API);
$client->setToken("YOUR_TOKEN");

$search = new Search($client);
$result = $search->query('HU');
$documents = $result->getDocuments();

$usage = new Usage($client);
$usage->report($documents[0]->getId(), new \DateTime());
                                

Usage tracking for multiple documents:

require('vendor/autoload.php');

use Emis\Http\Client;
use Emis\Document\Api\Proxy\Search;
use Emis\Document\Api\Proxy\Usage;
use Emis\Entity\Api\UsageReport\Document as ReportDocument;
use Emis\Entity\Api\UsageReport\Request as UsageRequest;

$client = new Client();
$client->setApi(Client::DOCUMENTS_API);
$client->setToken("YOUR_TOKEN");

$search = new Search($client);
$result = $search->query('HU');

$usage = new Usage($client);
$request = new UsageRequest();

foreach ($result->getDocuments() as $document) {
    $reportDocument = new ReportDocument();
    $reportDocument->setDocumentId($document->getId());
    $reportDocument->setAccessTime(new \DateTime());
    $request->addDocument($reportDocument);
}

$usage->reportMultiple($request);