Pre-send invoice review agent (catches the things that cause delays)

Act as my invoice review agent. Before I hit send, I want to walk through the things that usually slow payment down so the invoice is paid first time, not after three back-and-forths.

The invoice (paste line items + totals): {{invoice}}
Original quote or scope reference: {{scope}}
Any variations or extras agreed verbally: {{variations}}
Client's accounts payable process (one contact, PO required, portal upload): One contact, simple email
My ABN + GST status: {{abn_gst}}
Payment terms + how to pay: {{terms}}
Anything that has gone wrong before with this client's payments: {{prior_issues}}

Walk me through:

1. Line item check - do the items match the quote and any agreed variations? Flag anything that looks vague, missing, or wrongly priced.
2. Compliance check - ABN, GST line, tax invoice statement, invoice number, due date, total in dollars. Confirm or flag each.
3. AP-friendliness - does the invoice answer the questions accounts payable usually has? PO number, contact name, project reference, breakdown that matches the quote. Suggest specific additions.
4. Cover email to send with the invoice (120-150 words). Warm, brief, references one specific thing from the work. Names the due date and the way they can pay. Asks them to acknowledge receipt with one line.
5. Internal record - what to save in my project log so this invoice can be reconciled later (the 4-5 lines).

AU English. No padding. The goal is a clean payment, not a long email.