If you only have hand luggage and check-in on-line ahead of time, you can bypass the LAN counter and go right to the gate. You should be able to board without any additional questions.

If you are checking bags or somehow end up at the LAN counter, then you will most likely have to pay the fee. If this happens, you will probably have to go to another counter to pay the fee before you can get your boarding passes, so make sure to allow for additional time if you are planning on checking bags.