Room key in Apple Wallet and key card

What do I need to use a hotel room key in Apple Wallet?

How do I set up and use my hotel room key in Apple Wallet?

How is a room key in Apple Wallet different from other mobile hotel keys?

Which iPhones and Apple Watches are compatible?

Where can I use a hotel room key in Apple Wallet?

At which hotels can I use a room key in Apple Wallet?

How can I tell if I am able to use a hotel room key in Apple Wallet?

On how many iPhones and Apple Watches can a hotel room key in Apple Wallet be activated?

Can I use hotel room keys in Apple Wallet if I have multiple hotel rooms or multiple hotel stays booked?

Can I still access my hotel room if my iPhone runs out of battery?

What if my iPhone or Apple Watch is lost or stolen?

Can I use a hotel room key in Apple Wallet and a traditional hotel key card at the same time?