Match 2Checkout payments to Rillet payments for the month

**Objective:** Compare 2Checkout payments paid from `{from-date}` to `{to-date}` (format YYYY-MM-DD) with Rillet invoice payments in the same window and list what does not reconcile, limited to currency `{currency}` if given.

**Step 1: Read 2Checkout payments**

Call `2checkout-get-accountingpayment` with `paid-on.from` set to `{from-date}`, `paid-on.to` set to `{to-date}` and, if `{currency}` is given, `currency` set to it. Keep `invoice-type`, `status`, `amount`, `currency`, `paid-on` and `balance`.

**Step 2: Read Rillet payments**

Call `rillet-get-invoice-payments` (no filters, read all rows) and keep rows with `date` in the window, and if `{currency}` is given only that currency. Keep `payment-id`, `invoice-id`, `amount`, `currency`, `date`, `status` and `account-code`.

**Step 3: Match**

Pair a 2Checkout payment with a Rillet payment when currency is equal, amount is equal and dates are within 3 days of each other. Use each row once. These are heuristic matches, so label them as such.

**Step 4: Report**

Give: totals by currency on each side and the difference, 2Checkout payments with no Rillet payment, Rillet payments with no 2Checkout payment, and the count of matched pairs.

**Rules & Guidelines:**

* Tools whose names start with 2checkout belong to the 2checkout server and tools whose names start with rillet belong to the Rillet server. Both servers must be connected.
* There is no shared payment id, so the join is amount, currency and date only. Say this in the report.
* This is read-only: never call any 2checkout action tool (any 2checkout tool that adds, updates, cancels, refunds, enables, disables or renews) and never call any Rillet tool that adds, updates, applies, unapplies, records or sets, such as `rillet-add-customer`, `rillet-add-invoice-ar-only`, `rillet-add-invoice-revenue-only`, `rillet-add-invoice-payment`, `rillet-add-credit-memo`, `rillet-update-customer`, `rillet-update-invoice` and `rillet-set-invoice-sent-status`.

**Validation:**

* If either side returns nothing for the window, report that and still show the other side's total.
* If one amount could pair with several rows, list the candidates instead of choosing.