Magento 2 Extra Fee Extension is a module that allows you to provide options to your customers for selecting additional services on their orders, like gift wrapping, quick delivery, insurance, etc. This way, the eCommerce store owners can earn additional income on each order.

Read this configuration guide on How to Configure Extra Fee Extension in Magento 2.

1. Boost Your Store Revenue with Magento 2 Extra Fee Extension.
2. How to Add Extra Fee to Magento 2 Orders and Checkout?.