Product Reference

1). Why no option to check “Product Reference” on activation/deactivation action?
Now I use code:

// check "Product Reference" on the activation/deactivation of a license key
add_action('slm_api_listener_slm_activate', 'check_license_and_product_on_slm' );
add_action('slm_api_listener_slm_deactivate', 'check_license_and_product_on_slm' );
function check_license_and_product_on_slm() {
   if (isset($_REQUEST['item_reference'])) {
      $product_ref = sanitize_text_field(urldecode($_REQUEST['item_reference']));
      $key = trim(strip_tags($_REQUEST['license_key']));

      global $wpdb;
      $tbl_name = SLM_TBL_LICENSE_KEYS;
      $sql_prep1 = $wpdb->prepare("SELECT * FROM $tbl_name WHERE license_key = %s", $key);
      $retLic = $wpdb->get_row($sql_prep1, OBJECT);

      if ($retLic && $retLic->product_ref != $product_ref) {
         $args = (array('result' => 'error', 'message' => 'Your license key was not issued for this product'));
         SLM_API_Utility::output_api_response($args);
      }
   }
}

Any license code for any product – bad idea.

2). Please change options “Maximum Allowed Domains” and “Manual Reset Count” from “text” to “number”.

3). Please add possibility to unset “Date of Expiry” or set default value.