netsuite-php how to get all emails associated with account

My works setup is weird. For the customer account its setup as a business account and I can easily get the primary email address associated by doing

$service = new NetSuiteService($config);

use NetSuite\Classes\SearchStringField;
use NetSuite\Classes\CustomerSearchBasic;
use NetSuite\Classes\SearchRequest;
$service->setSearchPreferences(true, 1000, false);

$customerSearch = new CustomerSearchBasic;

$customerSearch->createdDate = array(
    'operator'    => 'after',
    'searchValue' => '2019-05-20T00:00:000-08:00',
);

$request = new SearchRequest;
$request->searchRecord = $customerSearch;
$response = $service->search($request);
//    echo $count . " records were found.";
$json_data = json_encode($response);
echo $json_data;

My problem is that there are many customers who have multiple contacts within the customer. How can I get those added to the output also for that company/customer.

Thanks!!!

source https://stackoverflow.com/questions/70040067/netsuite-php-how-to-get-all-emails-associated-with-account