Get first dibs on free Facebook Marketplace listings automatically

flowchart TD trig(["checks marketplace every few minutes"]):::trigtime s0[["scan new free listings"]]:::mi s1["filter out already messaged"]:::task s2["pick random message text"]:::task s3["send message after delay"]:::svc trig --> s0 s0 --> s1 s1 --> s2 s2 --> s3 gx{"× did the send succeed"}:::gate s3 --> gx p00["log listing to spreadsheet"]:::task gx -->|"send succeeded"| p00 p10["send alert email"]:::task gx -->|"send failed"| p10 p00 --> out p10 --> out out[/"seller messaged before competitors"/]:::out pay{{"grabs free items first every time"}}:::pay out --> pay esc(("Alerts a person")):::human s2 -. "if it fails" .-> esc esc -.-> 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