How to choose identifierType using updateContact with php?

Hello, could you please explain how to choose the identifierType in php, i would like to use ext_id.

Maybe you can extend the php example Update a contact

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

$config = SendinBlue\Client\Configuration::getDefaultConfiguration()->setApiKey('api-key', 'YOUR API KEY');

$apiInstance = new SendinBlue\Client\Api\ContactsApi(
    new GuzzleHttp\Client(),
    $config
);
$identifier = 'example@example.com';
$updateContact = new \SendinBlue\Client\Model\UpdateContact();

$updateContact['attributes'] = array('EMAIL'=>'example2@example2.com', 'FIRSTNAME'=>'John Doe');

try {
    $apiInstance->updateContact($identifier, $updateContact);
} catch (Exception $e) {
    echo 'Exception when calling ContactsApi->updateContact: ', $e->getMessage(), PHP_EOL;
}
?>

Many thanks in advance

Hi @tka , thanks for posting on this community.

Have you already tried any calls, and did you get any error messages?