code: func (api *API) AccessPolicy(zoneID, applicationID, policyID string) (AccessPolicy, error) {
  	uri := fmt.Sprintf(
  		"/zones/%s/access/apps/%s/policies/%s",
  		zoneID,
  		applicationID,
  		policyID,
  	)
  
  	res, err := api.makeRequest("GET", uri, nil)
  	if err != nil {
  		return AccessPolicy{}, errors.Wrap(err, errMakeRequestError)
  	}
  
  	var accessPolicyDetailResponse AccessPolicyDetailResponse
  	err = json.Unmarshal(res, &accessPolicyDetailResponse)
  	if err != nil {
  		return AccessPolicy{}, errors.Wrap(err, errUnmarshalError)
  	}
  
  	return accessPolicyDetailResponse.Result, nil
  }
docs: // AccessPolicy returns a single policy based on the policy ID.
  //
  // API reference: https://api.cloudflare.com/#access-policy-access-policy-details