Depending on your bank, you may be charged a processing fee for depositing on FanDuel. This fee is charged by your bank, and should be no more than 3% of the amount deposited.
To prevent these charges, you can always deposit via PayPal with either an existing PayPal account or by checking out as a guest. To check out as a guest, find the section that says "Pay with an online bank account, credit or debit card".
If you have any other questions about these fees or would like a credit to your FanDuel account for the amount of the charge, please submit a support ticket. Customer Support may ask you to provide proof that you were charged a fee. Please note that credits will only be given for deposits made within the last 90 days.