Method: GET

Endpoint: https://www.planetromeo.com/api/v4/messages?lang=en&length=MESSAGES_COUNT 

Headers: 

Default GET headers

Sample response:

{
    "cursors":{
        (This should be irrelevant if MESSAGES_COUNT is high enough – there doesn't seem to be a limit for that)
    },
    "items":[
        {
            "to":"RECIPIENT_ID",
            "text":"TEXT_CONTENT",
            "attachments":[
                {
                    "type":"IMAGE",
                    "error_text":"This App is outdated and cannot support all message features. Please log in to on www.planetromeo.com or update to the most recent App version.",
                    "params":{
                        "id":"ATTACHMENT_ID",
                        "owner_id":"ATTACHMENT_SENDER (usually equals SENDER_ID)",
                        "url_token":"URL_TOKEN",
                        "auth_token":"AUTH_TOKEN (seems irrelevant)"
                        "width":IMAGE_WIDTH (int),
                        "height":IMAGE_HEIGHT (int),
                        "rating":"IMAGE_RATING",
                        "is_public":ATTACHMENT_PUBLIC (bool, usually false?)
                    }
                },
                (More attachment objects)
            ],
            "id":"MESSAGE_ID",
            "from":"SENDER_ID",
            "date":"2000-01-01T12:00:00+0000",
            "expires":"2000-01-08T12:00:00+0000",
            "folder":"MESSAGE_FOLDER",
            "unread":READ_STATUS (bool),
            "locked":LOCKED_STATUS (?, bool),
            "spam":SPAM_STATUS (bool)
        },
        (More message objects)
    ]
}