code: func (api *API) ReprioritizeSSL(zoneID string, p []ZoneCustomSSLPriority) ([]ZoneCustomSSL, error) {
  	uri := "/zones/" + zoneID + "/custom_certificates/prioritize"
  	params := struct {
  		Certificates []ZoneCustomSSLPriority `json:"certificates"`
  	}{
  		Certificates: p,
  	}
  	res, err := api.makeRequest("PUT", uri, params)
  	if err != nil {
  		return nil, errors.Wrap(err, errMakeRequestError)
  	}
  	var r zoneCustomSSLsResponse
  	if err := json.Unmarshal(res, &r); err != nil {
  		return nil, errors.Wrap(err, errUnmarshalError)
  	}
  	return r.Result, nil
  }
docs: // ReprioritizeSSL allows you to change the priority (which is served for a given
  // request) of custom SSL certificates associated with the given zone.
  //
  // API reference: https://api.cloudflare.com/#custom-ssl-for-a-zone-re-prioritize-ssl-certificates