$curl_handle=curl_init();
$post_data='apiKey=ABCDEFG';
$post_data.='&name='.urlencode($_POST['name']);
$post_data.='&email='.urlencode($_POST['email']);
$post_data.='&cellphone='.urlencode($_POST['phone']);
$post_data.='&customertype='.urlencode($_POST['type']);
curl_setopt($curl_handle,CURLOPT_URL,'https://rental.software/api6/customers/');
curl_setopt($curl_handle, CURLOPT_TIMEOUT,5);
curl_setopt($curl_handle, CURLOPT_POST,1);
curl_setopt($curl_handle, CURLOPT_POSTFIELDS,$post_data);
curl_setopt($curl_handle,CURLOPT_RETURNTRANSFER,1);
$output_json = curl_exec($curl_handle);
$httpCode = curl_getinfo($curl_handle, CURLINFO_HTTP_CODE);
if($httpCode<>201 && $httpCode<>409){
//error
}
$output = json_decode($output_json);
$customer_id = $output->recordid;