Get pin list
{
"date": integer,
"success": boolean,
"error": string,
"size": integer,
"channel_name": string,
"elements": {
{
"index" : integer,
"timestamp": string,
"username": string,
"username_color": string,
"avatar_url": string,
"message_url": string,
"attachments": boolean,
"attachments_api": string,
"content_type": string,
"message": huge string, message is already html
}
}
}