Here are the context clues used in each sentence:
1. Examples - The context provides examples of what "vaping" means by describing the actions of inhaling and exhaling vapor from an e-cigarette device.
2. Antonyms - The word "unlike" indicates an antonym, providing a contrast between contactless payment technologies and traditional modes of payment.
3. Examples - The context gives a specific example of what "duck faces" means by describing the action of pressing lips together in the shape of a duck's bill.