What is BitPay transaction fee?

Excuse me, could you please clarify what the BitPay transaction fee entails? I'm interested in understanding the specifics of how it's calculated and what factors might influence its amount. Additionally, I'd appreciate any insights into whether this fee is standard across all transactions or if it varies depending on certain conditions. Lastly, I'm curious about any potential ways to minimize or avoid this fee altogether. Thank you for your time and assistance.