public async Task <IActionResult> GetCustomerByGuid([FromRoute] Guid guid)
        {
            if (!ModelState.IsValid)
            {
                return(BadRequest(ModelState));
            }
            var customers = await customersManager.GetCustomersByGuid(guid);

            if (customers == null)
            {
                return(NotFound());
            }
            return(Ok(customers));
        }