Creating a link in order item list

Hello there,
I’m trying to create a plugin which integrates my wordpress/woocommerce site with php application I’ve made and it seems I hit a wall.

I hooked into ‘woocommerce_after_order_itemmeta’ and successfully parsed some item meta-data (wc_get_order_item_meta($item_id)) that I need to work with.

Now the hard part though, I need an actual button which posts the parsed data to external php script and reads the response my REST server gives it (should return a link to generated QR code), I imagine I have to call a page specific to my plugin somehow. Please help