code: func (api *API) WAFRule(zoneID, packageID, ruleID string) (WAFRule, error) {
  	uri := "/zones/" + zoneID + "/firewall/waf/packages/" + packageID + "/rules/" + ruleID
  	res, err := api.makeRequest("GET", uri, nil)
  	if err != nil {
  		return WAFRule{}, errors.Wrap(err, errMakeRequestError)
  	}
  
  	var r WAFRuleResponse
  	err = json.Unmarshal(res, &r)
  	if err != nil {
  		return WAFRule{}, errors.Wrap(err, errUnmarshalError)
  	}
  
  	return r.Result, nil
  }
docs: // WAFRule returns a WAF rule from the given WAF package.
  //
  // API Reference: https://api.cloudflare.com/#waf-rules-rule-details