docs: public com.squareup.okhttp.Call getContractsPublicItemsContractIdAsync(Integer contractId, String datasource,
              String ifNoneMatch, Integer page, final ApiCallback<List<PublicContractsItemsResponse>> callback)
              throws ApiException {
  
          com.squareup.okhttp.Call call = getContractsPublicItemsContractIdValidateBeforeCall(contractId, datasource,
                  ifNoneMatch, page, callback);
          Type localVarReturnType = new TypeToken<List<PublicContractsItemsResponse>>() {
          }.getType();
          apiClient.executeAsync(call, localVarReturnType, callback);
          return call;
      }