I was not able to find relevant information in Protocol Specification. 
Could you please explain what is the meaning of Key::Name field in RefreshMessage with Domain Login: 
I used API Playground for streaming/pricing/v1 to get the following response:
[
  {
    "ID": 1,
    "Type": "Refresh",
    "Domain": "Login",
    "Key": {
      "Name": "AQIC5wM2LY4SfcxLk5nRbPAY8SEQYLD72qqSwzEhZ2ziIEU%3D%40AAJTSQACMTAAAlNLABE1Njc4NjMzODQ5MTg2MzI0NwACUzEAAjI2%23",
      "Elements": {....
The string "AQIC5wM2LY4SfcxLk...." - what does it contain? how can we use it?