Tap → WhatsApp opens the bot chat → keyword START_SURVEY is pre-typed in the input. User just taps send.
✓ Real validated pattern — Gerben confirmed live in Day 2 Istanbul meeting (27 May 2026). Channel of 6 followers, screenshot evidence, consumer WhatsApp Business app.
Multiple keywords route to different flows:
START_SURVEY → survey
START_REPORT → incident report
START_MENU → hub menu
START_INFO → safety info
This is a two-tap UX minimum: tap the wa.me link → tap send. No single-tap shortcut from a Channel post exists — there is no wa.me?flow_id= parameter.