Enforce Minimum Amount

• Enable – Enable/Disable extra fees by calculating the difference between the customer order total and the specified minimum amount.

• Minimum Amount – Set the minimum amount.

• Minimum Amount Title – Set custom title for minimum amount extra fee.

• Apply Group Filter – Set Yes if you want to charge a minimum amount of extra fee only from specific customer groups.

• Only for Customer Groups – Select the customer groups for a minimum amount of extra fee.

You can see that the minimum amount extra fee is applicable in the front end as per your backend settings.