Gravity Forms Vertical Response integration

add_action("gform_post_submission", "vr_subscribe", 10, 2);
function vr_subscribe($entry, $form){

    // the gform field id numbers
    $gf_field_id_optin      = '11.1'; // the gform field id for the subscribe opt-in checkbox
    $gf_field_id_first_name = 9;
    $gf_field_id_last_name  = 10;
    $gf_field_id_email      = 2;
    $gf_field_id_phone      = 3;
    $gf_field_id_state      = 12;

    // Vertical Response
    $vr_form_id             = '123xyx789eab';
    $source                 = urlencode('The name of your form');
    $site_admin_email       = 'test@test.com';

    if($entry[$gf_field_id_optin]){//opted-in

        //clean up needed?
        $fname      = strip_tags($entry[$gf_field_id_first_name]);
        $lname      = strip_tags($entry[$gf_field_id_last_name]);
        $useremail  = strip_tags($entry[$gf_field_id_email]);
        $phone      = strip_tags($entry[$gf_field_id_phone]);
        $state      = strip_tags($entry[$gf_field_id_state]);

        $language   = false;
        // if using the WPML plugin, pick up the language from the URL
        if(stripos($entry['source_url'],'/es/')!==false){
            $language = 'Spanish';
        } elseif(stripos($entry['source_url'],'/zh-hant/')!==false){
            $language = 'Chinese';
        }
        $url = "http://oi.vresp.com?fid=".$vr_form_id;

        $postFields = "first_name=".$fname;
        $postFields .= "&last_name=".$lname;
        $postFields .= "&email_address=".$useremail;
        $postFields .= "&home_phone=".$phone;
        $postFields .= "&state=".$state;
        $postFields .= "&language=".$language;
        $postFields .= "&source=".$source;

        //Start cURL
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $postFields);
        //If cURL is successful
        if ($response = curl_exec($ch)) {
            //mail($site_admin_email,"test successful",$url."\n".$postFields,"from:".$site_admin_email);
        } else {
            mail($site_admin_email,"There was an error posting to Vertical Response","Error:\n".$postFields,"from:".$site_admin_email);
        }
        curl_close($ch);

    } else {//didn't subscribe
        //no need to email site admin...
    }
    /* other available gform standard field data:
        id => 4
        form_id => 1
        date_created => 2012-09-27 14:01:53
        is_starred => 0
        is_read => 0
        ip => xx.xx.xx.xx
        source_url => http://...
        post_id =>
        currency => USD
        payment_status =>
        payment_date =>
        transaction_id =>
        payment_amount =>
        is_fulfilled =>
        created_by => 1
        transaction_type =>
        user_agent => Mozilla/5.0 (Windows NT 6.0; WOW64; rv:15.0) Gecko/20100101 Firefox/15.0.1
        status => active
    */
}