OPT申请的biometric services fee是什么？

[align="left"]这85刀biometric services fee是必须交的么？没太看懂这个fee是什么。。。[/align][align="left"]The filing fee for Form I-765 is $410, effective 12 a.m. Eastern U.S. time, December 23, 2016. You must also pay an $85 biometric services fee, for a total of $495, if you are: [/align]

• Requesting consideration of Deferred Action for Childhood Arrivals (DACA);
• A beneficiary of an approved employment-based immigrant petition and you are facing compelling circumstances; or
• A spouse or unmarried dependent child of a beneficiary of an employment-based immigrant petition who is facing compelling circumstances.
  

[align="left"]There is no biometric services fee for any other eligibility category.[/align][align="left"]Some individuals may be exempt from paying fees. See the form instructions for more information.[/align]