Send a message

The primary endpoint for starting a message. from is optional: 1. Automatic — omit from to use hybrid/default-priority/implicit Blooio routing. 2. Hybrid owner — { "from": { "type": "hybrid", "number": "+15551234567" } } uses the uniquely resolved, hybrid-enabled owner of that representative number for a one-to-one phone send or an existing group owned by that hybrid sender. 3. Channel type — { "from": { "type": "blooio" } } walks the priority using only that type. 4. Natural number — { "from": { "type": "blooio", "number": "+15551234567" } } selects an exact numbered sender. 5. Sender key — { "from": { "type": "rcs_business", "sender_key": "support" } } selects an exact non-numbered sender. 6. Technical id — { "from": { "id": "ch_..." } } is the advanced exact-channel form. Type/priority routing is history-first and content-aware. Poll content currently routes only through Blooio. Existing groups require an exact sender whose channel owns the group or a hybrid sender that owns that channel. Legacy top-level channel_id and priority_id remain supported. Returns the chosen channel_id, chat_id, and routing explanation.