code: func CreateWebHook(client *messagebird.Client, url, token string) (*Webhook, error) {
  	data := struct {
  		URL   string `json:"url"`
  		Token string `json:"token,omitempty"`
  	}{
  		URL:   url,
  		Token: token,
  	}
  	var resp struct {
  		Data []Webhook `json:"data"`
  	}
  	if err := client.Request(&resp, http.MethodPost, apiRoot+"/webhooks/", data); err != nil {
  		return nil, err
  	}
  	return &resp.Data[0], nil
  }
docs: // CreateWebHook creates a new webhook the specified url that will be called
  // and security token.