func apiCall(method string, params interface{}) (interface{}, error) {
    buf, err := json.Marshal(params)
    if err != nil {
        return nil, err
    }

    resp, err := http.Post("https://api.telegram.org/bot"+botToken+"/"+method, "application/json", bytes.NewBuffer(buf))
    if err != nil {
        return nil, err
    }
    defer resp.Body.Close()

    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        return nil, err
    }

    var Response Response
    err = json.Unmarshal(body, &Response)
    if err != nil {
        return nil, err
    }

    if Response.Ok != true {
        return Response.Result, err
    } else {
        return Response.Result, nil
    }
}