// Create a new client(创建一个新的Client实例).
    c := &alidayu.Client{AppKey: "", AppSecret: "", UseHTTPS: false}

    // ---------------------------------------
    // Send Verification Code in SMS(发送短信验证码).
    // ---------------------------------------
    // Set parameters(设置API所需的所有参数，包括公共参数和方法相关参数).
    params := map[string]string{}

    // Common parameters will be filled with default values automatically.
    // You may also set them to override default ones.
    // 公共参数会自动使用默认值填充，不需要用户设置.
    // 当然，用户可以使用自己的设置来覆盖默认值.
    //   params["format"] = "json"      // "json" or "xml"
    //   params["v"] = "2.0"            // "2.0" by default
    //   params["sign_method"] = "md5"  // "md5" or "hmac"

    // No need to set "timestamp" and "sign", these parameters will be calculated and filled automatically.
    // 不需要用户设置"timestamp"和"sign",这些参数会被自动计算和设置.

    // Set method specified parameters(设置方法相关特定参数).
    params["method"] = "alibaba.aliqin.fc.sms.num.send"           // Set method to send SMS(API接口名称).
    params["sms_type"] = "normal"                                 // Set SMS type(短信类型).
    params["sms_free_sign_name"] = ""                             // Set SMS signature(短信签名).
    params["sms_param"] = `{"code":"123456", "product":"My App"}` // Set variable for SMS template(短信模板变量).
    params["sms_template_code"] = ""                              // Set SMS template code(短信模板ID).
    params["rec_num"] = ""                                        // Set phone number to send SMS(短信接收号码).

    // Call Exec() to post the request.
    success, result, err := c.Exec(params)
    if err != nil {
            fmt.Fprintf(os.Stderr, "c.Exec() error: %v\nsuccess: %v\nresult: %v\n", err, success, result)
            return
    }

    fmt.Fprintf(os.Stderr, "c.Exec() successfully\nsuccess: %v\nresult: %s\n", success, result)

    // ------------------------------------------
    // Send Verification Code in Single Call(发送文本转语音通知验证码).
    // ------------------------------------------
    // Set Parameters.
    params = map[string]string{}
    params["method"] = "alibaba.aliqin.fc.tts.num.singlecall"     // Set method to make single call(API接口名称).
    params["tts_param"] = `{"code":"123456", "product":"My App"}` // Set variable for TTS template(文本转语音（TTS）模板变量).
    params["called_num"] = ""                                     // Set phone number to make single call(被叫号码).
    params["called_show_num"] = ""                                // Set show number(被叫号显).
    params["tts_code"] = ""                                       // Set TTS code(TTS模板ID).

    // Call Exec() to post the request.
    success, result, err = c.Exec(params)
    if err != nil {
            fmt.Fprintf(os.Stderr, "c.Exec() error: %v\nsuccess: %v\nresult: %v\n", err, success, result)
            return
    }

    fmt.Fprintf(os.Stderr, "c.Exec() successfully\nsuccess: %v\nresult: %s\n", success, result)