There are several RTB Objects that identified as important and missing from our the bid request.
I am just writing what I saw when trying to implement it, maybe there are more.
imp.Banner.TopFrame
0 mean no, 1 mean yes as state in the comment
regs.Coppa
0 mean disable, 1 mean enable
video.MinBitRate
it's a range and can be 0
when it's set to 0 we lose the ability to notify the buyers.
Let me know your thoughts.