Panama City's public transit card is the Metrobús card.
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Panama City uses the Metrobús card. The Metrobús card covers Panama City's metro and bus system.
You can buy it at metro/Metrobús 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.