// Enable method enables an Integration at OpsGenie.
func (cli *OpsGenieIntegrationClient) Enable(req integration.EnableIntegrationRequest) (*integration.EnableIntegrationResponse, error) {
	req.APIKey = cli.apiKey
	resp, err := cli.sendRequest(cli.buildPostRequest(enableIntegrationURL, req))

	if resp == nil {
		return nil, err
	}
	defer resp.Body.Close()

	var enableIntegrationResp integration.EnableIntegrationResponse
	if err = resp.Body.FromJsonTo(&enableIntegrationResp); err != nil {
		message := "Server response can not be parsed, " + err.Error()
		logging.Logger().Warn(message)
		return nil, errors.New(message)
	}

	return &enableIntegrationResp, nil
}