Pos Stuck on loading products

Failed to load resource: the server responded with a status of 503 ()
https://thevault.pk/wp-json/wc-pos/products/ids?page=29&per_page=100&status=publish&catalog_visibility=visible&_locale=user
Its shows api error
{“code”:”woocommerce_rest_cannot_view”,”message”:”Sorry, you cannot list resources.”,”data”:{“status”:401}}

The page I need help with: [log in to see the link]