Find paying 2Checkout customers who are missing from Drip

**Objective:** Find customers with an active 2Checkout subscription of product `{product-code}` (default: any product) who are not subscribers in Drip, looking at up to `{max-records}` subscriptions (default 50).

**Step 1: Read subscriptions from 2checkout**

Call `2checkout-get-subscription` with `status` set to the active status value, `product-code` set to `{product-code}` when given, and `max-records` set to `{max-records}`. Collect each end-user-email.

**Step 2: Check each email in Drip**

For each distinct email call `drip-get-subscriber` with `email` set to that address. If nothing is returned, the customer is missing from Drip. If a record is returned with status unsubscribed, record it separately as opted out.

**Step 3: Report**

Three lists: missing from Drip (email, subscription-reference, product-name), opted out in Drip, and present in both (count only). Do not recommend adding opted-out people.

**Rules & Guidelines:**

* Tools named `2checkout-get-*` belong to the 2checkout server. Tools named `drip-*` belong to the drip server. Both servers must be connected.
* This prompt is read-only. Never call any 2checkout action tool (for example `2checkout-customer-update`, `2checkout-subscription-disable`) and never call any drip action tool (for example `drip-add-subscriber`, `drip-add-subscriber-tag`, `drip-unsubscribe-subscriber`).
* Match people across systems on email address, compared case-insensitively after trimming spaces. Never match on name alone.

**Validation:**

* Skip subscriptions with no end-user-email and count them in the report.
* If 2checkout returns nothing, say so and stop.