Send automatic WhatsApp reminders for abandoned Shopify carts

flowchart TD trig(["scheduled abandoned cart check"]):::trigtime s0[["validate phone number"]]:::mi s1["send whatsapp reminder"]:::svc s2[("log attempt in sheet")]:::store trig --> s0 s1 --> s2 gx{"× phone number valid"}:::gate s0 --> gx p00["send reminder"]:::task gx -->|"valid number"| p00 p10["skip send"]:::task gx -->|"invalid number"| p10 jn{"○ log attempt"}:::gate p00 --> jn p10 --> jn jn --> s1 out[/"tracking sheet updated with results"/]:::out pay{{"recovered sales with no manual chasing"}}:::pay s2 --> out out --> pay s1 -. "failures recorded, run continues" .-> out 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