{"message":"Welcome to the Marketing Backend API","endpoints":{"health":"/health","subscription":{"activate":"POST /api/subs","deactivate":"POST /api/unsubs","status":"GET /api/status?msisdn=..."},"cron":{"transferInactive":"POST /api/cron/transfer-inactive"},"billing":{"bill":"POST /api/bill"},"sms":{"send":"POST /api/sms"},"postback":{"receive":"POST /api/postback","status":"GET /api/postback/status"},"callback":{"insms":"POST /insms (Safaricom notification callback)"},"documentation":"/docs/API.md"}}