code: public Map<String, Object> retrieve(String entityName, String groupId, String entityId, MnoHttpClient httpClient) throws AuthenticationException, ApiException, InvalidRequestException {
  		String jsonBody = httpClient.get(getInstanceUrl(entityName, groupId, entityId));
  		Type typeOfHashMap = HashMap.class;
  		return GSON.fromJson(jsonBody, typeOfHashMap);
  	}
docs: Fetch an entity by id
  
  @param entity
  name
  @param groupId
  customer group id
  @param entityId
  id of the entity to retrieve
  @param httpClient
  @return entity
  @throws AuthenticationException
  @throws ApiException
  @throws InvalidRequestException