Currently I am using WooCommerce for WordPress and trying to add custom fields for Variations Product. After did some researches, I found some code and tried to modify it.

This is my code : https://gist.github.com/alphadc/da163cc95cfd1cede34a

The field is showing on my backend, but when I tried to save the value, it's not working. I tried to modified it too, but still not working.

I found this code from several sources one of this came from : http://www.remicorson.com/woocommerce-custom-fields-for-variations/#comment-14159

I think this is because of the update of WooCommerce (I am using 2.3.5).

Can someone help me please?