# file: object/sms.go
func SendSms(provider *Provider, content string, phoneNumbers ...string) error {
	client, err := getSmsClient(provider)
	if err != nil {
		return err
	}

	if provider.Type == sender.Twilio {
		if provider.AppId != "" {
			phoneNumbers = append([]string{provider.AppId}, phoneNumbers...)
		}
	} else if provider.Type == sender.Aliyun || provider.Type == "Alibaba Cloud PNVS SMS" {
		for i, number := range phoneNumbers {
			phoneNumbers[i] = strings.TrimPrefix(number, "+86")
		}
	}

	params := map[string]string{}
	if provider.Type == sender.TencentCloud {
		params["0"] = content
	} else {
		params["code"] = content
	}

	# When the provider's type is 'Alibaba Cloud PNVS SMS', call the SendMessage method in sms_pnvs.go
	err = client.SendMessage(params, phoneNumbers...)
	return err
}

# file: object/sms_pnvs.go
func (c *PnvsSmsClient) SendMessage(param map[string]string, targetPhoneNumber ...string) error {
	if len(targetPhoneNumber) == 0 {
		return fmt.Errorf("missing parameter: targetPhoneNumber")
	}

	// PNVS sends to one phone number at a time
	phoneNumber := targetPhoneNumber[0]

	request := dypnsapi.CreateSendSmsVerifyCodeRequest()
	request.Scheme = "https"
	request.PhoneNumber = phoneNumber
	request.TemplateCode = c.template
	request.SignName = c.sign

	// TemplateParam is optional for PNVS as it can auto-generate verification codes
	// But if params are provided, we'll pass them
	if len(param) > 0 {
		templateParam, err := json.Marshal(param)
		if err != nil {
			return err
		}
		request.TemplateParam = string(templateParam)
	}

	response, err := c.core.SendSmsVerifyCode(request)
	if err != nil {
		return err
	}

	if response.Code != "OK" {
		if response.Message != "" {
			return fmt.Errorf(response.Message)
		}
		return fmt.Errorf("PNVS SMS send failed with code: %s", response.Code)
	}

	return nil
}