Questions on FIX Order Entry Messages 5.0

Exchange/Pro API
1

I have few questions on FIX Order Entry Messages 5.0 on Coinbase Exchange API

  1. There is FIX 5.0 and FIX 4.2 version. Which one is better in terms of latency?
  2. In FIX 5.0 Logon (35=A) message, from the doc ( Exchange FIX Order Entry Messages 5.0 | Coinbase Cloud) there is RawDataLength (tag 95) field. However from the FIX dictionary I don’t find such field. Which one is correct?
  3. There is no example on how to sign the message in FIX 5.0 - the link doc points to RESTful one. Is there any working sample to show how it is done?

Thanks!

2

There is a discussion about message signing in the 4.2 documentation for the 35=A (Logon Message). Scroll down a bit.

I haven’t tried coding this up yet, so I don’t know if it works for 5.0. I’ve seen some code snippets through google searches that lead me to believe that it will work.