Send queued SMS and WhatsApp messages automatically through Twilio

flowchart TD trig(["hourly queue check"]):::trigtime s0[["route message to channel"]]:::mi s1["send via twilio"]:::svc s2[("log message sent")]:::store trig --> s0 s1 --> s2 gx{"× which channel to use"}:::gate s0 --> gx p00["send as text message"]:::task gx -->|"sms channel"| p00 p10["send as whatsapp message"]:::task gx -->|"whatsapp channel"| p10 jn{"○ message sent"}:::gate p00 --> jn p10 --> jn jn --> s1 out[/"queued messages sent and logged"/]:::out pay{{"automated messaging with audit trail"}}:::pay s2 --> out out --> pay s1 -. "retries on failure" .-> s1 classDef task fill:#e7f6fe,stroke:#34b8f0,color:#2c2a29 classDef svc fill:#f6f8fa,stroke:#7c8795,color:#2c2a29 classDef mi fill:#e7f6fe,stroke:#0079a8,color:#2c2a29,stroke-width:2px classDef human fill:#fff,stroke:#0079a8,color:#0079a8 classDef store fill:#f6f8fa,stroke:#0079a8,color:#2c2a29 classDef trig fill:#00a4eb,stroke:#0079a8,color:#fff,font-weight:bold classDef trigtime fill:#00a4eb,stroke:#0079a8,color:#fff,font-weight:bold classDef trigdata fill:#8ad4f5,stroke:#0079a8,color:#06314c,font-weight:bold classDef gate fill:#fff,stroke:#e8a23d,color:#6b4708,font-weight:bold classDef out fill:#1f9d6b,stroke:#167a53,color:#fff,font-weight:bold classDef pay fill:#06314c,stroke:#021f33,color:#fff