Put a revenue figure next to a Constant Contact campaign

**Objective:** Measure the Business Central revenue from customers who engaged with the Constant Contact campaign `{campaign-name}`, counting posted sales invoices dated within `{attribution-days}` days (default 30) after the campaign was sent.

**Step 1: Find the campaign in Constant Contact**

Call `constant-contact-get-campaign` with `name.contains` set to `{campaign-name}`. If more than one campaign matches, list them with `name`, `status` and `last-sent-date` and stop so the user can choose. If the campaign has no `last-sent-date`, say it has not been sent and stop. Keep `campaign-id`, `last-sent-date`, `sends`, `opens` and `clicks`.

**Step 2: Collect the engaged contacts**

Call `constant-contact-get-campaign-click` with `campaign-id`, then `constant-contact-get-campaign-open` with `campaign-id`. Build one list of distinct `email-address` values, recording for each whether the contact clicked or only opened.

**Step 3: Match each contact to a Business Central customer**

For each email, call `business-central-get-customer` with `email` set to the address. If no customer comes back, count the contact as engaged but not a customer and move on. If several come back, list all of them in the report rather than picking one.

**Step 4: Pull the invoices**

For each matched customer, call `business-central-get-posted-sales-invoice` with `sell-to-customer-number` set to the `customer-number`, `posting-date.from` set to the campaign's `last-sent-date`, and `posting-date.to` set to `{attribution-days}` days (default 30) after it. Sum `total-amount` per customer.

**Step 5: Report**

* A header line: campaign name, sent date, sends, opens, clicks, attribution window.
* Totals: engaged contacts, matched customers, customers who bought in the window, invoiced amount (by `currency-code` if there is more than one currency).
* A table of buying customers: customer number, name, email, clicked or opened, invoice count, invoiced amount, first invoice date.
* The number of engaged contacts with no Business Central customer.

State plainly that this is correlation within a time window, not proof the campaign caused the sale.

**Rules & Guidelines:**

* `constant-contact-get-campaign`, `constant-contact-get-campaign-click` and `constant-contact-get-campaign-open` are on the constant-contact server; `business-central-get-customer` and `business-central-get-posted-sales-invoice` are on the business-central server.
* Read-only. Do NOT call `constant-contact-add-contact`, `constant-contact-update-contact`, `business-central-create-sales-invoice`, `business-central-update-customer` or any other create, update or add tool.
* Pass `company` to Business Central tools only if the user names a company.

**Validation:**

* If nobody opened or clicked, report the send counts and stop.
* Compare emails ignoring case. Never match on name.
* Business Central dates are yyyy-MM-dd; convert the Constant Contact sent date to that format before filtering.