When a guest is wearing the medallion, they can order a drink with their smartphone or open their cabin door automatically by standing in front of it. Which emerging technology does Cloud combine with to enable this medallion's features?

The Ocean Medallion.

Explanation:

The Ocean Medallion is a handheld interface that, on boarding a cruise liner, digitally attaches to multiple devices. They could order a cocktail with their mobile or instantly open the cockpit door by walking in front of something while a guest wears the ocean medallion.