code: public List<AllianceContactsResponse> getAlliancesAllianceIdContacts(Integer allianceId, String datasource,
              String ifNoneMatch, Integer page, String token) throws ApiException {
          ApiResponse<List<AllianceContactsResponse>> resp = getAlliancesAllianceIdContactsWithHttpInfo(allianceId,
                  datasource, ifNoneMatch, page, token);
          return resp.getData();
      }
docs: Get alliance contacts Return contacts of an alliance --- This route is
  cached for up to 300 seconds SSO Scope: esi-alliances.read_contacts.v1
  
  @param allianceId
  An EVE alliance ID (required)
  @param datasource
  The server name you would like data from (optional, default to
  tranquility)
  @param ifNoneMatch
  ETag from a previous request. A 304 will be returned if this
  matches the current ETag (optional)
  @param page
  Which page of results to return (optional, default to 1)
  @param token
  Access token to use if unable to set a header (optional)
  @return List&lt;AllianceContactsResponse&gt;
  @throws ApiException
  If fail to call the API, e.g. server error or cannot
  deserialize the response body