require_once('/path/to//vendor/autoload.php');

<?php
require_once(__DIR__ . '/vendor/autoload.php');

// Configure OAuth2 access token for authorization: oauth
$config = CoverService\Configuration::getDefaultConfiguration()->setAccessToken('YOUR_ACCESS_TOKEN');

$apiInstance = new CoverService\Api\CoverApi(
    // If you want use custom http client, pass your client which implements `GuzzleHttp\ClientInterface`.
    // This is optional, `GuzzleHttp\Client` will be used as default.
    new GuzzleHttp\Client(),
    $config
);
$type = "type_example"; // string | The type of the identifier, i.e. 'isbn', 'faust', 'pid' or 'issn'
$identifiers = array("identifiers_example"); // string[] | A list of identifiers of {type}. Maximum number os identifiers per reqeust is 200
$sizes = array("sizes_example"); // string[] | A list of image sizes (Cloudinary transformations) for the cover(s) you want to receive.

try {
    $result = $apiInstance->getCoverCollection($type, $identifiers, $sizes);
    print_r($result);
} catch (Exception $e) {
    echo 'Exception when calling CoverApi->getCoverCollection: ', $e->getMessage(), PHP_EOL;
}
?>