One row per SKU: units sold and the fee lines from the order-level export summed over the window, joined to your cost of goods, with a gross profit and margin.

This is a GROSS / CONTRIBUTION view, not a net bottom line. The fees here are the ones TikTok books against the order itself — referral, affiliate commission, refunds, discounts and the like — and ad spend is NOT among them: TikTok does not attribute ad spend to a single SKU, so gross_profit is revenue less those per-SKU fees less COGS, and stops one step short of net earnings. For the true shop-level bottom line that includes ad spend, use POST /pnl/summary and POST /pnl/profit. If you request the net_earnings or total_expense columns they are the order-line totals and likewise exclude ad spend.

gross_profit is an upper bound while units_uncosted is non-zero — uncosted units are counted, never assumed free. Windowed by order PAID date; single shop only.