OpenIntegrations/docs/en/examples/Telegram/SendTextMessage.txt

    Token     = FunctionParameters["Telegram_Token"];
    ChatID    = FunctionParameters["Telegram_ChatID"];
    ChannelID = FunctionParameters["Telegram_ChannelID"];
    Text      = FunctionParameters["String"];

    KeyboardButtonsArray = New Array;
    KeyboardButtonsArray.Add("Button1");
    KeyboardButtonsArray.Add("Button2");

    Keyboard = OPI_Telegram.FormKeyboardFromButtonArray(KeyboardButtonsArray, True);
    Result   = OPI_Telegram.SendTextMessage(Token, ChatID, Text, Keyboard);

    Result = OPI_Telegram.SendTextMessage(Token, ChannelID, Text);