curl "https://api.phrase.com/v2/projects/:project_id/keys/:key_id/comments" \
  -u USERNAME_OR_ACCESS_TOKEN \
  -X POST \
  -d '{"branch":"my-feature-branch", "message":"Some message...", "locale_ids": ["someId"]}' \
  -H 'Content-Type: application/json'

{
  "id": "abcd1234cdef1234abcd1234cdef1234",
  "message": "Some message...",
  "has_replies": true,
  "user": {
    "id": "abcd1234cdef1234abcd1234cdef1234",
    "username": "joe.doe",
    "name": "Joe Doe"
  },
  "created_at": "2015-01-28T09:52:53Z",
  "updated_at": "2015-01-28T09:52:53Z",
  "locales": [
    {
      "id": "abcd1234cdef1234abcd1234cdef1234",
      "name": "English",
      "code": "en-GB"
    }
  ]
}