code: func (mgr *Mgr) ProcessAttributeRequestsForCert(requests []AttributeRequest, attributes []Attribute, cert *x509.Certificate) error {
  	attrs, err := mgr.ProcessAttributeRequests(requests, attributes)
  	if err != nil {
  		return err
  	}
  	return mgr.AddAttributesToCert(attrs, cert)
  }
docs: // ProcessAttributeRequestsForCert add attributes to an X509 certificate, given
  // attribute requests and attributes.