Check whether an unpaid Stripe customer is still active in 2Checkout

**Objective:** Find the Stripe invoices for the customer with email `{email}` that are not fully paid and show whether that customer's 2Checkout subscriptions are still active.

**Step 1: Stripe invoices**

Call `stripe-get-invoice` (stripe server) with `customer-email` set to `{email}` and `status` set to `open`. Keep invoice-id, number, total, amount-remaining, due-date, subscription-id, hosted-invoice-url. If nothing comes back, try `status` `uncollectible` and then report that there is nothing to chase.

**Step 2: 2Checkout subscriptions**

Call `2checkout-get-subscription` (2checkout server) with `end-user-email` set to `{email}`. Keep subscription-reference, product-name, status, expiration-date.

**Step 3: Report**

List each unpaid Stripe invoice (number, amount remaining, due date, link), then the 2Checkout subscriptions with status and expiration. State plainly whether the customer is unpaid in Stripe while still active in 2Checkout.

**Rules & Guidelines:**

* `2checkout-*` tools are on the 2checkout server; `stripe-*` tools are on the stripe server. Both servers must be connected.
* This prompt is read-only. Never call any 2checkout write tool (any `2checkout-*` tool that adds, updates, cancels, refunds, disables, extends or deletes, such as `2checkout-order-refund`, `2checkout-subscription-disable`, `2checkout-customer-update`).
* Stripe tools here are reads only. Do not guess values; report only what the tools return.
* The two systems share no subscription id; join only on the customer email.

**Validation:**

* If Stripe has no unpaid invoice, stop after Step 1.
* If 2Checkout returns no subscription, report the customer as absent from 2Checkout.