What is the taker fee on OKCoin?

Could you please elaborate on the taker fee structure imposed by OKCoin? As a cryptocurrency enthusiast, I'm particularly interested in understanding the specific percentage or amount charged for market orders that remove liquidity from the exchange's order book. Does the taker fee vary depending on the trading pair or volume traded? Additionally, are there any incentives or discounts available for high-volume traders to reduce their overall taker fee burden? Your insights would be greatly appreciated.