r_fullprofile, r_network, r_emailaddress, w_share, w_messages

URL:https://api.linkedin.com/v1/people/~/mailbox

{
    body = "I'd like to add you to my professional network on LinkedIn!";
    "item-content" =     {
        "invitation-request" =         {
            authorization =             {
                name = "NAME_SEARCH";
                value = DNZy;
            };
            "connect-type" = friend;
        };
    };
    recipients =     {
        values =         (
                        {
                person =                 {
                    "_path" = "/people/linkedIn-id";
                };
            }
        );
    };
    subject = "Invitation to connect!";
}

{
    errorCode = 0;
    message = "Internal service error";
    requestId = E31HKE6KM7;
    status = 500;
    timestamp = 1474549122972;
}