After successful installation of Extra Fee for Magento 2 extension, you are now required to configure the license key in the admin configuration section. You can set it from:

Step 1: Go to, Admin Control Panel > Stores > Configuration > Mage Delight > Extra Fee > License Configuration. 

You will find two text boxes asking for Serial Key and Activation Key, which you received on email upon the purchase of extension. See screenshot below:

• Serial Key: Enter Serial Key
• Activation Key: Enter Activation Key

Step 2: Expand “General Configuration” tab, you will find a list of domains for which license is purchased and configured, now select the domain you are going to use, you can select multiple domains by clicking “Ctrl + Select”.

Step 3: Now, select “Yes” from “Enable Module” to enable extension and again click on “Save Config” button on the top right.

• Calculate fees after discount: Select 'Yes', if you want to calculate the extra fee based on the prices after discount applied.
• Calculate fees after tax: Select 'Yes', if you want to calculate the extra fee based on the prices after tax applied.
• Calculate fees after shipping: Select 'Yes', if you want to calculate the extra fee based on the prices after shipping applied.
• Auto Apply on Single Option: Select 'Yes', if you want to set auto apply extra fee if there is only single option found.
• Show Tool-tip: Select 'Yes', if you want to show tool tip on front-end.

• Grid: Grid to manage all previously added extra fees for your store. You can search and edit extra fee from here.
  

• Fee Information: Expand the tab to find more options for fees. Provide fees related options and configurations.
• Manage Options: Expand the tab to find more options for extra fee options configurations.
• Conditions: Expand the tab to configure conditions to apply/display extra fees.

• Fee Name: Provide unique identifier/name for extra fee.
• Enable Fee: Select "Yes" to enable extra fee for front-end.
• Required: Select "Yes", to make extra fees as required in front-end.
• Display Type: Select display type to create control in front end
• Store View: Select Store Views to enable extra fees. You can select multiple store views, too.

• Customer Group: Select customer groups to enable extra fees for specific customer groups. You can select multiple customer groups.
• Description: Provide description for extra fee.
• Sort Order: Provide sort order to display extra fees in front-end if multiple extra fees found.

• Is Default: Select option to make as default. Default option will be selected initially in front end.
• Price: Provide price for the option.
• Apply As: Select "Fixed" if you want to apply price as fixed or select "Percentage" to calculate price dynamically based on product price with set percentage.
• Admin: Provide option labels to display in store views.

• Calculate fees after discount: Select 'Yes', if you want to calculate the extra fee based on the prices after discount applied. If you have selected as default then it will apply as per global configuration.
• Calculate fees after tax: Select 'Yes', if you want to calculate the extra fee based on the prices after tax applied. If you have selected as default then it will apply as per global configuration.
• Calculate fees after shipping: Select 'Yes', if you want to calculate the extra fee based on the prices after shipping applied. If you have selected as default then it will apply as per global configuration.

• Conditions: Select conditions to apply extra fees if matches.

Extra Fee in Order (Admin Panel)

• In admin panel you will find option as shown in above image to apply extra fees while placing an order from back-end.

• Apply Extra fees on shopping cart page

• Apply Extra fees on checkout page