Work it out yourselves as adults not a trap on the waiter. Meanwhile as adults, the invitee has the right the claim the bill, otherwise split it. There are rare exceptions and you all should be mature enough to sort that out through conversation.

Exceptions: if a friend is unemployed or having trouble and I’m not I’ll always offer gently to pick up the bill. Don’t fight if they refuse. There’s a few friends where we alternate for historical reasons There’s one friend who helped my family in a way I don’t consider ever able to pay back, they know in advance that they don’t pay for meals if they’re with us. Because it’s simply the least we can do.