code: public CoinbaseContacts getCoinbaseContacts(
        Integer page, final Integer limit, final String filter) throws IOException {
  
      final CoinbaseContacts contacts =
          coinbase.getContacts(
              page,
              limit,
              filter,
              exchange.getExchangeSpecification().getApiKey(),
              signatureCreator,
              exchange.getNonceFactory());
      return contacts;
    }
docs: Authenticated resource that returns contacts the user has previously sent to or received from.
  
  @param page Optional parameter to request a desired page of results. Will return page 1 if the
  supplied page is null or less than 1.
  @param limit Optional parameter to limit the maximum number of results to return. Will return
  up to 25 results by default if null or less than 1.
  @param filter Optional String match to filter addresses. Matches the address itself and also if
  the use has set a ‘label’ on the address. No filter is applied if {@code filter} is null or
  empty.
  @return {@code CoinbaseContacts} the user has previously sent to or received from.
  @throws IOException
  @see <a
  href="https://coinbase.com/api/doc/1.0/contacts/index.html">coinbase.com/api/doc/1.0/contacts/index.html</a>