Check a Shopify order against its FreshBooks invoice

**Objective:** Find the FreshBooks invoice for Shopify order `{order-name}` (for example #1001) and report whether the totals and payment state agree. FreshBooks company: `{company}`.

**Step 1: Read the order** (shopify server)

Call `shopify-get-order` with `name` set to `{order-name}`. If nothing returns, stop and say the order was not found. Keep order-id, order-number, email, customer-id, total-price, currency, financial-status, created-at and cancelled-at.

**Step 2: Find the invoice** (freshbooks server)

Call `freshbooks-get-client` with `email` set to the order email and `company` set to `{company}` to get the client id. If no client matches, report the order as having no FreshBooks client and stop.
Then call `freshbooks-get-invoice` with `customer-id` set to that client id, `company` set to `{company}` and `create-date.from` set to the order date minus 7 days. Match the invoice whose `po-number` or `invoice-number` equals the order name or order-number. If none matches, report the order as present in Shopify and not invoiced in FreshBooks.

**Step 3: Compare and report**

Show a table: order total vs invoice amount, currency vs currency-code, financial-status vs payment-status, and outstanding. Mark each Match or Differs and give the difference amount.

**Rules & Guidelines:**

* `shopify-get-order` is on the shopify server; `freshbooks-get-client` and `freshbooks-get-invoice` are on the freshbooks server.
* Read-only. Do not call any add-, update-, delete-, mark- or send- tool on either server.

**Validation:**

* If several invoices could match, list them and ask which one; do not guess.
* Shopify total-price includes tax and shipping; say so when the totals differ by exactly the tax or shipping amount.
* A cancelled Shopify order (cancelled-at set) should be flagged, not compared.