Turn a failed Stripe payment into a Salesforce follow-up

**Objective:** For the Stripe customer with email `{customer-email}`, summarize what is unpaid and, only after the user confirms, create one Salesforce follow-up task due in `{due-in-days}` days (default 3).

**Step 1: Read the payment problem in Stripe**

Call `stripe-get-customer` with `email` set to `{customer-email}`. If nothing comes back, say so and stop. With its customer-id, call `stripe-get-invoice` (customer-id, status open) and `stripe-get-charge` (customer-id, status failed, created.from today minus 30 days). If there is nothing open and no failed charge, report that the customer is paid up and stop without writing.

**Step 2: Find the contact in Salesforce**

Call `salesforce-get-contact` with `email` set to `{customer-email}`. If none matches, report the customer as present in Stripe and absent from Salesforce and stop without writing. If several match, list them and ask which one to use.

**Step 3: Propose the task and wait**

Show the user exactly what will be written: subject "Payment follow-up: <amount and currency> outstanding in Stripe", who-id the contact-id, what-id the contact's account-id, due-date today plus `{due-in-days}` days, and comments listing each open invoice number with amount-remaining and due-date, each failed charge with amount and failure-message, and the hosted-invoice-url where present. Ask the user to confirm. Do not write anything until they say yes.

**Step 4: Write once, then confirm**

After a yes, call `salesforce-add-task` once with those values. Then call `salesforce-get-task` with `account-id` set to the account-id and `subject.contains` set to "Payment follow-up" and report the task that was created.

**Rules & Guidelines:**

* `stripe-get-customer`, `stripe-get-invoice` and `stripe-get-charge` are on the stripe server. `salesforce-get-contact`, `salesforce-add-task` and `salesforce-get-task` are on the salesforce server.
* `salesforce-add-task` is the only tool that may write, once, after the user confirms. Do not call `salesforce-update-task`, `salesforce-add-case`, `salesforce-update-opportunity`, `salesforce-update-contact`, `salesforce-update-account` or any other salesforce add or update tool.
* If the user declines, stop and write nothing.

**Validation:**

* If `salesforce-add-task` returns an error, report it verbatim and do not retry with different values without asking.
* Never add amounts in different currencies together; list each currency separately in the subject and comments.