用 AI 幫你入賬：由一張單據到支出摘要

I've uploaded receipts (photos or PDFs). Extract these fields from each one, one block per receipt:
- date (YYYY-MM-DD)
- merchant
- category (meals / transport / office supplies / software / marketing / professional services / travel / other)
- amount and currency
- payment method (only if it's on the receipt)
- receipt number (only if it's on the receipt)

Rules:
1. Read only what is actually visible on the receipt. If you can't read it, write "unclear" — do not guess.
2. Take the total printed on the receipt as the amount. If the line items don't add up to that total, give me both numbers and flag the mismatch.
3. List service charge, tip and tax separately. Don't fold them in as ordinary spending.
4. When you're done, list the fields you were unsure about, so I can check them myself.

Turn those receipts into a table, one row per entry, with these columns in this order:

date | merchant | category | amount | currency | payment method | receipt number | notes

Rules:
1. Dates always YYYY-MM-DD, so they sort properly.
2. Amounts as digits only — no currency symbols, no thousands separators (e.g. 1280.50). Currency goes in its own column.
3. Use only the categories I listed. Don't invent new ones. If something genuinely fits none of them, write "other" and explain in the notes column.
4. Leave a field blank if you couldn't read it. Don't write "N/A", and don't guess.
5. Output as CSV so I can paste it straight into Google Sheets or Excel.
6. No totals row at the bottom — I'll calculate that in the spreadsheet.

Using the table above, write an expense summary I can paste straight into a spreadsheet or a monthly report:
1. Total spend for the period, by currency
2. Each category's amount and share, largest first
3. The five largest individual expenses, with dates and merchants
4. If I've given you last period's figures, compare: which categories rose, and by what percentage
5. One closing line: the single thing most worth noticing this period

Rules: every number must be calculated from the table. Don't add anything that isn't in it, and don't state a conclusion stronger than the data supports.

Goal: from this month's spending, identify the major expenses, the anomalies, and anything worth my attention.

I'm giving you every receipt for the month at once. Work through this whole routine yourself — don't check in at each step:

1. Read: extract date, merchant, category, amount and currency from each receipt.
2. Categorise: use only these fixed categories — meals / transport / office supplies / software / marketing / professional services / travel / other.
3. Find anomalies: flag anything matching one of these —
   - the same merchant charging more than once in a short window
   - an amount more than 50% above the average for its category
   - a merchant appearing for the first time this month
   - a receipt total that doesn't match its line items
   - a merchant that doesn't belong in the category it landed in
4. Analyse: which categories dominate? Which costs recur every month, and which were one-offs?
5. Summarise: one page or less — total, category breakdown, top 5 expenses, the anomaly list.
6. Recommend: three specific ways to spend less, each pointing at the actual expenses that support it.

Rules:
- Every conclusion must name the receipt or the line it came from. Don't tell me anything I can't trace back.
- Anything you couldn't read, or that's missing data, goes in a "needs input from me" list. Don't fill it in yourself.
- No investment or tax advice. Only what the numbers themselves show.
- Work through all six steps, then reply once.