URL    = FunctionParameters["Bitrix24_URL"];
    ChatID = "chat4";

    Result = OPI_Bitrix24.GetChatMessagesList(URL, ChatID);

    URL    = FunctionParameters["Bitrix24_Domain"];
    Token  = FunctionParameters["Bitrix24_Token"];
    UserID = 10;

    Result = OPI_Bitrix24.GetChatMessagesList(URL, UserID, , 0, Token);