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

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



// Configure API key authorization: ApiKey
$config = OpenAPI\Client\Configuration::getDefaultConfiguration()->setApiKey('ApiKey', 'YOUR_API_KEY');
// Uncomment below to setup prefix (e.g. Bearer) for API key, if needed
// $config = OpenAPI\Client\Configuration::getDefaultConfiguration()->setApiKeyPrefix('ApiKey', 'Bearer');


$apiInstance = new OpenAPI\Client\Api\ApplianceApi(
    // 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
);
$id = 'id_example'; // string | The ID of the appliance
$entity_document_input = new \OpenAPI\Client\Model\EntityDocumentInput(); // \OpenAPI\Client\Model\EntityDocumentInput | An entity document input object. The data attribute should be a base 64 encoded string.

try {
    $result = $apiInstance->appliancesIDDocumentPost($id, $entity_document_input);
    print_r($result);
} catch (Exception $e) {
    echo 'Exception when calling ApplianceApi->appliancesIDDocumentPost: ', $e->getMessage(), PHP_EOL;
}

?>