The MasterToken is that last requested token for a user in a company
a user can have multiple tokens assigned to Company/User/AppId but only the latest token is the MasterToken
MasterTokens are the only token that can be used to request a token refresh
and behave like a combined APIKey / Refresh key in the oAuth 2.0 protocol
Read more in dkAuth 1.0
Client with Token
var clientWithToken = new IItemServiceservice(){TokenSecurityValue = new TokenSecurity() { AppID = "OrgApp", Token = "65550a75-5ceb-4dd1-adbf-3035c04afeff" }};