Reconcile Chargebee invoices to Business Central for month end

**Objective:** For `{customer-id}` (default: all customers, limited to `{max-invoices}` invoices, default 50), check that each Chargebee invoice dated from `{date-from}` has a matching posted sales invoice in Business Central with the same total.

**Step 1: Read the Chargebee invoices**

Call `chargebee-get-invoice` (Chargebee server) with `date.from` set to `{date-from}`, `customer-id` set to `{customer-id}` when given, and `max-records` set to `{max-invoices}`. If nothing comes back, report that and stop. Keep `id`, `customer-id`, `date`, `total`, `amount-due`, `status` and `currency-code` for each.

**Step 2: Resolve the Business Central customer**

For each distinct `customer-id`, call `chargebee-get-customer` (Chargebee server) with `id`, take its `email`, then call `business-central-get-customer` (Business Central server) with that `email` and keep `customer-number`. If no Business Central customer is found, mark all that customer's invoices "customer missing in Business Central" and move on.

**Step 3: Find the posted invoice**

Call `business-central-get-posted-sales-invoice` (Business Central server) with `sell-to-customer-number` set to the customer-number and `posting-date.from` set to `{date-from}`. Match each Chargebee invoice to a Business Central invoice first on `external-document-number` equal to the Chargebee invoice `id`, then on `your-reference`, and only then on equal `total-amount-including-tax` within 3 days of the Chargebee `date`. Label which rule matched.

**Step 4: Report**

Give counts of matched, amount-different, missing in Business Central and customer-missing. Then a table of every exception: Chargebee invoice id, customer, date, Chargebee total, Business Central invoice number, Business Central total, difference, match rule.

**Rules & Guidelines:**

* `chargebee-get-invoice` and `chargebee-get-customer` are on the Chargebee server; `business-central-get-customer` and `business-central-get-posted-sales-invoice` are on the Business Central server.
* Read-only. Do not call `business-central-create-sales-invoice` or any other create or update tool.
* Ignore Chargebee invoices whose `status` is voided or not yet posted when counting missing ones, but list them separately.

**Validation:**

* If currencies differ, compare in the original currency and flag it rather than converting.
* If more than one Business Central invoice matches, list all candidates and do not pick one.