The full fee is $1200.
The additional $15 fee added to this online purchase is to help cover approximately half of the fees charged for processing online. 
For your records, please note this payment is paying $300 toward the balance of $1200. Not $315 toward the balance of $1200.
 
We are sorry, but there is nothing we can do. 
 
Please also note, this will require making this payment four times total before full payment deadline.