{"message":"WhatsApp message send & receive","receive":{"verify":"GET /webhook (Meta verification)","events":"POST /webhook (Meta sends incoming messages here)"},"send":{"send_message":"POST /messages/send"},"api":{"customers":"GET /api/customers (list; ?phone= for one)","public_categories":"GET /api/public/categories","documents_ingest":"POST /api/documents/ingest (S3 paths + business_id or owner_whatsapp)","documents_health":"GET /api/documents/health (?business_id= to verify points after ingest)"}}