public IActionResult Save([FromBody] GroupCreateDto req)
        {
            if (req == null)
            {
                return(BadRequest());
            }
            //var groupEntity = req;
            var groupEntity = Mapper.Map <ProductGroup>(req);

            _posrepo.SaveProductGroup(groupEntity);
            return(CreatedAtRoute("GetCustomerById", new { id = groupEntity.Id }, groupEntity));
        }