How to include additional information in the email from other plugins

Hello,

We are using this plugin:
https://wordpress.org/plugins/license-manager-for-woocommerce/

When an order is marked as completed a serial key (license key) related to the ordered product is sent to the user via email.

When we enable your plugin the license is no longer sent via email. Would you please mention that how we can include it in the email?

All the best.