Extract and validate invoice data from Gmail automatically

flowchart TD trig>"new invoice email arrives"]:::trig s0["extract invoice data"]:::task s1["verify line item totals"]:::task s2["match purchase order number"]:::task s3[("log invoice in sheet")]:::store trig --> s0 s0 --> s1 s1 --> s2 gx{"× does PO number match"}:::gate s2 --> gx p00["log as verified"]:::task gx -->|"matched"| p00 p10["flag for review"]:::task gx -->|"mismatch"| p10 jn{"○ merge into log"}:::gate p00 --> jn p10 --> jn jn --> s3 out[/"invoice logged with flags"/]:::out pay{{"faster accurate invoice processing"}}:::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