code: public <T> T all(String entityName, String groupId, Map<String, ?> params, MnoHttpClient httpClient, Class<T> clazz) throws AuthenticationException, ApiException, InvalidRequestException {
  		String jsonBody = httpClient.get(getCollectionUrl(entityName, groupId), MnoMapHelper.toUnderscoreHash(params));
  		return GSON.fromJson(jsonBody, clazz);
  	}
docs: Return all the entities matching the parameters and using the provided client
  
  @param entity
  name
  @param groupId
  customer group id
  @param params
  criteria
  @param httpClient
  MnoHttpClient to use
  @return list of entities
  @throws AuthenticationException
  @throws ApiException
  @throws InvalidRequestException