Pull invoice details from Gmail attachments into Google Sheets

flowchart TD trig>"invoice email arrives in Gmail"]:::trig s0["check for duplicate invoice"]:::task s1["parse PDF into text"]:::task s2["extract invoice details with AI"]:::svc s3[("add row to Google Sheets")]:::store trig --> s0 s1 --> s2 s2 --> s3 gx{"× already processed"}:::gate s0 --> gx p00["skip and end"]:::task gx -->|"duplicate found"| p00 p10["continue processing"]:::task gx -->|"new invoice"| p10 p00 --> s1 p10 --> s1 out[/"invoice row added to sheet"/]:::out pay{{"invoices tracked without manual entry"}}:::pay s3 --> out out --> pay 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