Gravity Forms coupon code - wp ajax

function ajax_getchoices_fromfield() {
    global $wpdb;
    $form_id = false;

    if(strip_tags($_POST['adminLabel'])){
        $adminLabel = strip_tags($_POST['adminLabel']);
    }
    if(intval($_POST['form_id'])){
        $form_id = intval($_POST['form_id']);
    }

    if(isset($adminLabel) && $form_id > 0){
        $choices = array();
        // get the choices from a hidden admin-only field
        //$result = $wpdb->get_row("SELECT display_meta FROM med_rg_form_meta WHERE form_id = ".(int)$form_id, ARRAY_A);
        //$display_meta = unserialize($result['display_meta']);
        $display_meta = GFAPI::get_form($form_id);// switched to use the GF API

        if(!empty($display_meta['fields'])){
            foreach($display_meta['fields'] as $key=>$field){
                // pull out just the hidden admin-only coupon codes, or whichever adminlabel
                if($field['adminOnly']==1 && $field['adminLabel']==$adminLabel){
                    $choices = $field['choices'];
                }
            }
        }
        if(!empty($choices)){
            echo json_encode($choices);
        }
    }
    exit;
}
add_action('wp_ajax_getchoices_fromfield', 'ajax_getchoices_fromfield');
add_action('wp_ajax_nopriv_getchoices_fromfield', 'ajax_getchoices_fromfield');//for users that are not logged in.