One collections list across Chargebee and FreshBooks

**Objective:** Build one collections list of customers who owe money in Chargebee, enriched with their open FreshBooks invoices (company `{company}`), for invoices more than `{days-overdue}` days past due (default 0).

**Step 1: Read Chargebee**

Call `chargebee-get-invoice` with `due-date.to` set to today minus `{days-overdue}` days and `amount-due.min` just above zero. Keep `customer-id`, `id`, `amount-due`, `due-date`, `dunning-status`, `currency-code`. Group by customer.

**Step 2: Resolve each customer**

Call `chargebee-get-customer` with `id` to get `email` and company. Then call `freshbooks-get-client` with that `email`.

**Step 3: Read FreshBooks**

For each matched client, call `freshbooks-get-invoice` with `customer-id` set to the client `id` and `outstanding.min` just above zero. Keep `invoice-number`, `outstanding`, `due-date`, `display-status`.

**Step 4: Report**

One row per customer: email, Chargebee amount due and oldest due date, dunning status, FreshBooks outstanding total and oldest due date, and combined exposure per currency. Sort by combined exposure, largest first. Customers not found in FreshBooks show "no FreshBooks record".

**Rules & Guidelines:**

* FreshBooks tools (named freshbooks-...) are on the freshbooks server; Chargebee tools (named chargebee-...) are on the chargebee server. Both servers must be connected.
* Pass `{company}` as the company parameter on every FreshBooks call when it is given; if FreshBooks reports more than one company and none was given, ask which one and stop.
* Match customers on email, case-insensitive and trimmed. Never match on name alone.
* Amounts may be in different currencies; compare only when `currency-code` matches and flag the rest.
* This prompt is read-only. Never call any FreshBooks add, update, delete, mark or send tool, for example `freshbooks-add-payment`, `freshbooks-add-client`, `freshbooks-add-invoice` or `freshbooks-send-invoice-by-email`.

**Validation:**

* If nobody is overdue in Chargebee, say so and stop.
* Never add the two systems' amounts together unless the currency matches.