code: public List<CorporationContactsLabelsResponse> getCorporationsCorporationIdContactsLabels(Integer corporationId,
              String datasource, String ifNoneMatch, String token) throws ApiException {
          ApiResponse<List<CorporationContactsLabelsResponse>> resp = getCorporationsCorporationIdContactsLabelsWithHttpInfo(
                  corporationId, datasource, ifNoneMatch, token);
          return resp.getData();
      }
docs: Get corporation contact labels Return custom labels for a
  corporation&#39;s contacts --- This route is cached for up to 300 seconds
  SSO Scope: esi-corporations.read_contacts.v1
  
  @param corporationId
  An EVE corporation 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 token
  Access token to use if unable to set a header (optional)
  @return List&lt;CorporationContactsLabelsResponse&gt;
  @throws ApiException
  If fail to call the API, e.g. server error or cannot
  deserialize the response body