Github bitfinex api bot, adding Flags

Hi, I never did anything in golang. Want to learn this language but need to make this working in short time.
github project
bitfinex api docs

on github you can see a file cascadebot.go where I need to implement a information about one Flag, which is HIDDEN (info on links from bitfinex api docs). I was working with API just to get information in PHP but never send something somewhere and in GO I have no experiences at all. If I understand right, the value of Flags should be int 64 for HIDDEN=1. But I am not sure how exactly and where to write this in the code.

Can please someone help me with this? Thanks a lot.

Which request needs the flag?

I did it in javascript/nodejs way in the end from scratch. This bot is years old with old API version without flags option.