/**
  * Show time tracking metabox.
  * @param  WP_Post $post
  * @param  array $metabox
  * @return
  */
 public static function show_subscription_payments_meta_box($post, $metabox)
 {
     $invoice = SI_Invoice::get_instance($post->ID);
     $recurring_payment = SI_Payment_Processors::get_recurring_payment($invoice);
     self::load_addon_view('admin/meta-boxes/invoices/subscription-payments', array('invoice_id' => $post->ID, 'recurring_payment' => $recurring_payment, 'fields' => self::subscription_options($invoice)), false);
 }