Give Constant Contact non-openers a second chance in Drip

**Objective:** Give Constant Contact non-openers a second chance through Drip. Take the people who did not open the Constant Contact campaign named `{campaign-name}` and, after confirmation, subscribe them to the Drip email series campaign named `{drip-campaign-name}`.

**Step 1: Find the Constant Contact campaign and its non-openers**

Call `constant-contact-get-campaign` with `name` set to `{campaign-name}`. If there is no exact match, list near matches from `name.contains` and stop. Note `campaign-id` and `last-sent-date`. Then call `constant-contact-get-campaign-not-open` with `campaign-id` set to it. Collect the distinct `email-address` values.

**Step 2: Drop anyone who opted out**

Call `constant-contact-get-campaign-unsubscribe` with `campaign-id` set to the same id and remove those addresses. For each remaining address, call `drip-get-subscriber` with `email` set to it and remove anyone whose Drip `status` is unsubscribed.

**Step 3: Find the Drip campaign**

Call `drip-get-campaign` with `name` set to `{drip-campaign-name}`. If there is no exact match, list near matches from `name.contains` and stop. Note `campaign-id` and `status`; if it is not active, warn that enrolled people will not be mailed until it is. Then call `drip-get-campaign-subscriber` with `campaign-id` set to it and remove anyone already enrolled.

**Step 4: Confirm**

Show the counts (non-openers, removed as opted out, already enrolled, to enrol) and a table of the people to enrol: email, in Drip yet (yes or no). Ask: "Subscribe these N people to the Drip campaign?" Note that Drip creates anyone it does not have yet. Do nothing until the user says yes.

**Step 5: Write and confirm**

For each confirmed person, call `drip-add-subscriber-to-campaign` once with `email` set to the address and `campaign_id` set to the Drip campaign id. Then call `drip-get-campaign-subscriber` with the Drip `campaign-id` and confirm they are listed.

**Step 6: Report**

A table: email, result (enrolled, already enrolled, skipped as opted out, failed).

**Rules & Guidelines:**

* `constant-contact-get-campaign`, `constant-contact-get-campaign-not-open` and `constant-contact-get-campaign-unsubscribe` are on the constant-contact server. `drip-get-subscriber`, `drip-get-campaign`, `drip-get-campaign-subscriber` and `drip-add-subscriber-to-campaign` are on the drip server.
* The only write allowed is `drip-add-subscriber-to-campaign`, after Step 4.
* Do NOT call `drip-activate-campaign`, `constant-contact-resend-campaign-to-non-openers` or any other action. Pick one channel for the second send; this prompt uses Drip.

**Validation:**

* If the campaign has no non-openers, say so and stop.
* Never enrol anyone unsubscribed in either system.
* If more than 500 people would be enrolled, ask the user to confirm the number again before writing.