@Kruw made these two awesome tutorials on how to use coinjoin in BTCPay. 
https://www.youtube.com/watch?v=zGVCrwMKKn0
https://www.youtube.com/watch?v=g5nFckPfPcA

But the more the better! 

 Big thanks to you and @Kruw for making these happen, I'll link them in the tutorial. 🫂