gistfile1.json

POST to "https://www.yammer.com/api/v1/activity.json?access_token=<my valid access token>"

{
  "activity":{
    "actor":{
      "email":"[email protected]",
      "name":"Chris Pal"
    },
    "action":"pawdev:attend",
    "object":{
      "url":"https://localhost:44302/",
      "type":"pawdev:training",
      "title":"Yammer development training",
      "image":"https://localhost:44302/images/yammer-signin.gif",
      "description":"Yammer platform in 8 hours"
    },
    "private":false,
    "message":null,
    "users":null
  }
}

HTTP/1.1 400 Bad Request
...
{"errors":["Missing required param \"activity\""]}