When I have a typical wallet, I can give my Xpub to someone to generate addresses whenever they need. ("they" here could be an instance of BTCPAY server or some other application that I don't want to expose private keys to).
When I have a multisig scheme/wallet. How do addresses get generated? And is there an equivalent key (Xpub, zpub etc) that I could generate and put in my btcpay server?