How much does BitPay charge for trading?

Excuse me, could you please clarify the fees associated with trading through BitPay? I'm interested in understanding the cost structure for using their platform to facilitate cryptocurrency transactions. Are there any transaction fees, deposit or withdrawal charges that I should be aware of? Additionally, does BitPay offer any discounts or fee reductions for high-volume traders or frequent users of their service? It would be greatly appreciated if you could provide a detailed breakdown of their fee structure.