How to Disarm SHM via Keypad?

SmartApps & Automations Automation Ideas
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As @oldcomputerwiz said, it can’t be done in the new V3 app. They have changed their design philosophy for security features. See the FAQ:

FAQ: Why can’t I use Geopresence or an Automation to set the alarm state in the new (V3) app? (also applies to unlocking smart locks)