Unless explicitly stated on the documentation for a method, the accepted Web API call content types are:
      
      Calls using any other content type (ex: text/plain) are not supported.
     
    
  - 
    APIs
  
- 
    TeamDynamix.Api.Accounts.AccountSearch
  
  TeamDynamix.Api.Accounts.AccountSearch.CustomAttributes
  The custom attributes to filter on.