Magestore Giftvoucher

1. Open js/magestore/giftvoucher/giftvoucher.js and find the following code:

   if (typeof(save_shipping_method) != 'undefined')
       save_shipping_method(shipping_method_url);
   

2. Replace all occurrences of this code with:

   document.fire('giftvoucher:success');
   if (typeof(save_shipping_method) != 'undefined')
       save_shipping_method(shipping_method_url);
   

   and save the file.

3. Disable javascript merge/minification if needed.