Santiago's public transit card is the Bip! card.
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Santiago uses the Bip! card. The Bip! card covers the Santiago Metro and buses, and is required — cash isn't accepted on board.
You can buy it at metro stations.
Usually yes — it's typically faster than buying paper tickets and often cheaper per ride, even for just a couple of days.
In some cities you can tap a contactless card or phone directly, though it's worth checking current signage or the transit authority's site, since not every system supports it yet.