Stop urging customers on credit hold to order more

**Objective:** Find Dynamics GP customers on credit hold and add those who are subscribed in the Mailchimp audience `{list-name}` to the static segment or tag `{segment-name}`, after confirmation.

**Step 1: Find the audience and segment**

Call `mailchimp-get-list` with name `{list-name}` and keep its `list-id`; if none or several match, list them and stop. Call `mailchimp-get-segment` with that list-id and name `{segment-name}` and keep `segment-id`. If the segment does not exist, tell the user to create it as a static segment or tag in Mailchimp and stop. If its type is not static, say members cannot be added to it and stop.

**Step 2: Read the GP customers on hold**

Call `dynamics-gp-get-rm-customer` with hold true, inactive false and max-records 500. Skip customers with a blank `main-email-address`.

**Step 3: Match to the audience**

Call `mailchimp-get-list-member` with list-name `{list-name}` and max-records 1000, and match on lower-cased email. Call `mailchimp-get-segment-member` with the segment-id to find who is already in the segment.

**Step 4: Propose the additions**

Show a table of matched customers not yet in the segment: customer-id, customer-name, email, customer-balance, Mailchimp status. List separately the on-hold customers that are not in the audience. Ask the user to confirm all rows or name the ones to drop.

**Step 5: Add after confirmation**

Only after confirmation, call `mailchimp-add-segment-member` once per confirmed row with segment-id, list-id and email-address. Report each row as Added or Failed with the error text.

**Rules & Guidelines:**

* `dynamics-gp-get-rm-customer` is on the dynamics-gp server. `mailchimp-get-list`, `mailchimp-get-segment`, `mailchimp-get-list-member`, `mailchimp-get-segment-member` and `mailchimp-add-segment-member` are on the mailchimp server.
* `mailchimp-add-segment-member` is the only tool that may write, and only after confirmation.
* Do NOT call `mailchimp-add-list-member`, `mailchimp-update-list-member`, `dynamics-gp-rm-customer-update` or `dynamics-gp-rm-customer-note`. This prompt never changes a hold.

**Validation:**

* If no customers are on hold, say so and stop.
* Never add someone who is not already an audience member; the segment add fails for them anyway.