Mailchimp

Subsets supports syncing data to Mailchimp using the Marketing API Batch operations /3.0/batches endpoint, which wraps calls to the member tags endpoint /lists/{list_id}/members/{subscriber_hash}/tags.

Subsets writes experiment data to Mailchimp as member tags (not merge fields). Each tag encodes a name:value pair and is created automatically on every member:

{
  'subsets_experiment_id:{experiment_id}',
  'subsets_experiment_name:{experiment_name}',
  'subsets_experiment_added_at:{added_at}',
  'subsets_subscriber_churn_risk:{churn_risk}',
  'subsets_experiment_assignment:{assignment}'
}

Campaign linking uses the Search campaigns endpoint: you enter an email title in Subsets and pick the matching campaign(s) to link to an experiment.

note

The Mailchimp API only exposes regular emails. Automation Flow emails are not searchable, so their email IDs must be added manually.

Setup guide

1. Create an API key in Mailchimp (Account → Extras → API keys).
2. Share the credentials listed below.

Required credentials

Credential	Description
API Key	Mailchimp Marketing API key (used as the password for Basic Auth)
Server Prefix	Data center prefix for your account, e.g. us16 (the suffix of your API key and dashboard URL)
List ID	Audience / list ID that experiment members belong to