public async Task <IActionResult> AddMarket(long id, [FromBody] AddMarketSellerDTO addedMarketSeller)
        {
            // check if requester is trying to add a market to another seller
            if (id != addedMarketSeller.SellerId)
            {
                return(Forbid());
            }

            // check if requester is part of the seller
            if (!await _permissionService.UserIsSeller(HttpContext.GetUserIdFromToken(), id))
            {
                return(Forbid());
            }

            return(Ok(await _sellerService.AddMarketToSeller(addedMarketSeller)));
        }