Comprehensive comparison of WhatsApp, Discord, and Gmail message flows:
- Unified architecture overview showing shared components
- Channel comparison matrix (connection, reception, routing, delivery)
- Detailed sequence diagrams for each channel
- Key files and functions for each step
- Channel-specific features (threads, reactions, webhooks)
- Data structure comparison (inbound messages, session keys)
- Guide for adding new channels
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>