Show the BigCommerce orders behind a Salesforce case

**Objective:** Show the BigCommerce orders that give context to Salesforce case `{case-number}`, looking back `{lookback-days}` days (default 180).

**Step 1: The case in Salesforce**

Call `salesforce-get-case` (Salesforce server) with `case-number` set to `{case-number}`. If nothing comes back, report that and stop. Keep `subject`, `status`, `priority` and the contact details. Call `salesforce-get-contact` with the case's contact email or `account-id` to get the contact `email`.

**Step 2: Orders in BigCommerce**

Call `bigcommerce-get-customer` (BigCommerce server) with `email` set to the contact email. If none matches, report the contact as not a store customer and stop. Otherwise call `bigcommerce-get-order` with `customer-id` and `date-created.from`, and for any order that looks related to the subject call `bigcommerce-get-order-product` with `order-id`.

**Step 3: Report**

Case summary, then a table of orders (id, date, status, payment status, total, refunded amount) and the items on the most likely related order. Say which order seems relevant and why, or that none obviously is.

**Rules & Guidelines:**

* `salesforce-get-case` and `salesforce-get-contact` are on the Salesforce server; `bigcommerce-get-customer`, `bigcommerce-get-order` and `bigcommerce-get-order-product` are on the BigCommerce server.
* Read-only. Do not call `salesforce-update-case`, `salesforce-add-case` or any BigCommerce write tool.

**Validation:**

* If the case has no contact, say the orders cannot be linked and stop.
* If the contact matches more than one BigCommerce customer, list them and stop.