Como obter a lista de categorias e sub-categorias cadastrados via API ?

URL: http://www.nomedoseusite.com.br/api_ds_categories.php?action=categories_list

PHP Sample:

 // sample list categories and sub-categories
 
 $url = $domain_url . '/api_ds_categories.php?action=categories_list';

 $ch = curl_init($url);
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); 
 curl_setopt($ch, CURLOPT_HTTPHEADER, array( 
 'Content-Type: application/json',
 "Cache-Control: no-cache", 
 'Token: ' . base64_encode($token),
 'Secret: ' . base64_encode($secret),
 'E-mail: ' . base64_encode($email))
 );
 
 $result = curl_exec($ch);
 curl_close($ch);

 print_r($result);

 // sample list categories and sub-categories eof

Return:

id
text