If you enable the “Product attribute” option and generate EANs with our tool, it will copy the generated EAN to the selected product attribute as well for each product. This feature was requested by one of our customers.
> can we have MPN for each SKU, variation?
As mentioned on wp.org, unfortunately, it’s not currently possible to have multiple fields. I.e., you can have MPN (by setting our “Type” option to “Custom”, etc.), however, you won’t be able to set another field (e.g. EAN) simultaneously for a product. I’ve added this to our to-do list, however, adding multiple fields to a product will require a lot of changes in the plugin code, so I’m not really sure how long it will take. Meanwhile, as mentioned on wp.org, you can use our How to Add MPN to WooCommerce snippet to add the MPN field.
> Is there any chance for lifetime license?
Unfortunately, we don’t offer lifetime licenses for this plugin.
Hope this helps. Please let me know if you have any questions.