Create and send itemized PayPal invoices from a simple form

flowchart TD trig(("user submits invoice form")):::human s0(("submit client and invoice details")):::human s1["generate invoice number and date"]:::task s2[["add line items"]]:::mi s3["create and send invoice"]:::svc trig --> s0 s0 --> s1 s1 -->|"one per each line item entered"| s2 s2 --> s3 out[/"sent itemized paypal invoice"/]:::out pay{{"saves time and prevents billing errors"}}:::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