Find paid Shopify orders with no FreshBooks invoice

**Objective:** Report paid Shopify orders created since `{since-date}` (default: 30 days ago) that have no invoice in FreshBooks company `{company}`.

**Step 1: List paid orders** (shopify server)

Call `shopify-get-order` with `financial-status` set to paid and `created-at.from` set to `{since-date}`. Keep order-id, name, email, total-price, currency and created-at. Skip orders with cancelled-at set.

**Step 2: List invoices** (freshbooks server)

Call `freshbooks-get-invoice` with `company` set to `{company}` and `create-date.from` set to `{since-date}`. Keep invoice-number, po-number, customer-id and amount.

**Step 3: Match**

An order is invoiced when an invoice has po-number or invoice-number equal to the order name. For orders left over, call `freshbooks-get-client` with the order email to see whether a client exists, so the report can say whether a client is also missing.

**Step 4: Report**

A table of uninvoiced orders: order name, date, email, total, currency, FreshBooks client exists (yes or no). End with counts: orders checked, invoiced, uninvoiced.

**Rules & Guidelines:**

* `shopify-get-order` is on the shopify server; `freshbooks-get-invoice` and `freshbooks-get-client` are on the freshbooks server.
* Read-only. Do not call `freshbooks-add-invoice`, `freshbooks-add-client` or any other write tool.

**Validation:**

* If either list is empty, say which side and stop.
* If a call hits its record cap, say the result may be incomplete and suggest a shorter date range.