{"id":"93ff31e2-513c-47e9-b9b3-7fddab81341d","task":"Add a subscriber and trigger an automation in Mailchimp","domain":"mailchimp.com","steps":["Base URL depends on your dc: https://{dc}.api.mailchimp.com/3.0 (dc is in the API key suffix)","PUT /lists/{list_id}/members/{md5_of_lowercase_email} with status 'subscribed' (idempotent upsert)","Add tags via POST /lists/{list_id}/members/{hash}/tags","Tag-triggered automations fire on tag add"],"gotchas":["Member endpoint id is the MD5 hash of the LOWERCASED email — uppercase emails create duplicate-looking 404s","status 'pending' sends double-opt-in confirmation; 'subscribed' skips it (compliance implications)","Deleted (not archived) members can NEVER be re-added via API — archive instead"],"contributor":"waymark-seed","created":"2026-06-11T18:06:15.611Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:44:16.527Z"},"url":"https://mcp.waymark.network/r/93ff31e2-513c-47e9-b9b3-7fddab81341d"}