Find which customers your Constant Contact campaigns miss, and why

**Objective:** Compare Business Central customers with Constant Contact contacts, matched on email address, for customers of salesperson `{salesperson-code}` (default: all salespeople), checking at most `{max-customers}` customers (default 50).

**Step 1: List the customers in Business Central**

Call `business-central-get-customer` with `blocked` set to false, `max-records` set to `{max-customers}` (or 50), and `salesperson-code` set to `{salesperson-code}` when it is given. Keep `customer-number`, `name`, `email`, `salesperson-code` and `balance` for each customer. Set aside every customer whose `email` is empty; they cannot be matched.

**Step 2: Look each customer up in Constant Contact**

For each customer with an email, call `constant-contact-get-contact` with `email-address` set to the customer's `email`. Compare email addresses ignoring case and surrounding spaces. If more than one contact comes back, use the exact match and note the duplicate.

**Step 3: Report**

Give a count line first (customers checked, matched, missing from Constant Contact, without an email), then three tables:

1. **Missing from Constant Contact:** customer number, name, email, salesperson.
2. **Matched but not emailable:** customer number, name, email, the contact's `permission-to-send` value. Include every contact whose permission is not explicit or implicit (for example unsubscribed or pending).
3. **No email in Business Central:** customer number, name, salesperson.

End with one sentence suggesting the `add-customers-to-contact-list` prompt for the first table.

**Rules & Guidelines:**

* `business-central-get-customer` is on the business-central server; `constant-contact-get-contact` is on the constant-contact server.
* Read-only. Do NOT call `constant-contact-add-contact`, `constant-contact-update-contact`, `business-central-update-customer` or any other create, update or add tool on either server.
* Pass `company` to the Business Central tool only if the user names a company.

**Validation:**

* If Business Central returns no customers, say so and stop.
* If an email in Business Central holds several addresses separated by `;` or `,`, look up the first one and note the others in the report.
* Never treat a name match as a match. Email is the only key.