code: public Set<AuthorisationData> convertIdentifyingTokenList(Set<IdentifyingToken> tokens) {
          Set<AuthorisationData> resultList = new HashSet<>();
  
          for (IdentifyingToken token : tokens) {
              resultList.add(convertIdentifyingToken(token));
          }
  
          return resultList;
      }
docs: Converts a set of {@code IdentifyingToken} to a set of {@code AuthorisationData}.
  
  @param tokens    set of identifying tokens.
  @return set of authorisation data objects.