Get a list of private messages for a user

{
  "type": "object",
  "properties": {
    "primary_groups": {
      "type": "array",
      "items": {
        "type": "object"
      }
    },
    "topic_list": {
      "type": "object",
      "properties": {
        "can_create_topic": {
          "type": "boolean"
        },
        "draft": {
          "type": [
            "string",
            "null"
          ]
        },
        "draft_key": {
          "type": "string"
        },
        "draft_sequence": {
          "type": "integer"
        },
        "per_page": {
          "type": "integer"
        },
        "topics": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "allowed_user_count": {
                "type": "integer"
              },
              "archetype": {
                "type": "string"
              },
              "archived": {
                "type": "boolean"
              },
              "bookmarked": {
                "type": "boolean"
              },
              "bumped": {
                "type": "boolean"
              },
              "bumped_at": {
                "type": "string"
              },
              "category_id": {
                "type": [
                  "string",
                  "null"
                ]
              },
              "closed": {
                "type": "boolean"
              },
              "created_at": {
                "type": "string"
              },
              "fancy_title": {
                "type": "string"
              },
              "featured_link": {
                "type": [
                  "string",
                  "null"
                ]
              },
              "has_summary": {
                "type": "boolean"
              },
              "highest_post_number": {
                "type": "integer"
              },
              "id": {
                "type": "integer"
              },
              "image_url": {
                "type": [
                  "string",
                  "null"
                ]
              },
              "last_posted_at": {
                "type": "string"
              },
              "last_poster_username": {
                "type": "string"
              },
              "last_read_post_number": {
                "type": "integer"
              },
              "like_count": {
                "type": "integer"
              },
              "liked": {
                "type": "boolean"
              },
              "notification_level": {
                "type": "integer"
              },
              "participants": {
                "type": "array",
                "items": {
                  "type": "object",
                  "properties": {
                    "description": {
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "extras": {
                      "type": "string"
                    },
                    "primary_group_id": {
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "user_id": {
                      "type": "integer"
                    }
                  }
                }
              },
              "pinned": {
                "type": "boolean"
              },
              "pinned_globally": {
                "type": "boolean"
              },
              "posters": {
                "type": "array",
                "items": {
                  "type": "object",
                  "properties": {
                    "description": {
                      "type": "string"
                    },
                    "extras": {
                      "type": "string"
                    },
                    "primary_group_id": {
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "user_id": {
                      "type": "integer"
                    }
                  }
                }
              },
              "posts_count": {
                "type": "integer"
              },
              "reply_count": {
                "type": "integer"
              },
              "slug": {
                "type": "string"
              },
              "title": {
                "type": "string"
              },
              "unpinned": {
                "type": [
                  "string",
                  "null"
                ]
              },
              "unread_posts": {
                "type": "integer"
              },
              "unseen": {
                "type": "boolean"
              },
              "views": {
                "type": "integer"
              },
              "visible": {
                "type": "boolean"
              }
            }
          }
        }
      }
    },
    "users": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "avatar_template": {
            "type": "string"
          },
          "id": {
            "type": "integer"
          },
          "name": {
            "type": "string"
          },
          "username": {
            "type": "string"
          }
        }
      }
    }
  }
}