See what was returned, credited and refunded in NetSuite

**Objective:** Summarize returns and credits from {date-from} (default 90 days ago), optionally for one {customer}.

**Step 1: Returns**

Call `netsuite-get-returnauthorization` with `date.from` and, if given, `customer`. Note `status`.

**Step 2: Credits and refunds**

Call `netsuite-get-creditmemo` and `netsuite-get-customerrefund` with `date.from` and the same customer. Call `netsuite-get-cashrefund` with `date.from` only (it has no customer filter), and keep rows that you can tie to the customer by document number or currency; otherwise report them as unmatched.

**Step 3: Report**

Per customer: returns raised, credits issued and refunds paid, with counts and values where the tool returns an amount. List returns with no credit or refund yet, and credits with no refund. Say plainly which amounts you could not obtain.

**Rules & Guidelines:**

* This is a read-only job. Do not call any tool whose name starts with netsuite-add- or netsuite-update-, and never change, create or delete a record.
* Report only what the tools return. Do not estimate or invent figures; if a total is needed, add up the rows you actually retrieved and say so.
* If a read returns the maximum number of rows, say the result may be truncated and suggest narrowing the filters.
* Dates are YYYY-MM-DD. Where an input is blank, use the default stated in the Objective.

**Validation:**

* If a read returns nothing, say so and stop rather than guessing.
* If an input is ambiguous, list the candidates and ask which one is meant.