$url =  'https://txtria.com/api/intl-available-numbers'; 
$data = array(
	'country_iso_2' => 'AU',
	'type' => 'MOBILE',
);
$ch = curl_init();
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
$response = curl_exec($ch);
curl_close($ch);
echo $response;

{
    "success": "1",
    "data": [
        {
            "number": "+61448836490",
            "country_iso_2": "AU",
            "type": "MOBILE"
        },
        {
            "number": "+61455429157",
            "country_iso_2": "AU",
            "type": "MOBILE"
        }
    ]
}