Log API @stacId and Account

Hi,
I like use Log API to post logs. I saw documentation using below request.

{

 "message": "User 'xyz' logged in",
 "logtype": "accesslogs",
 "service": "login-service",
 "hostname": "login.example.com"
}

Here how to add @stackId and Account name to which we want to post log. We use different newrelic accounts for production and Development.