audience_idis also required. It is the id of your Mailchimp Audience where all the contact creations and updates will be done by Didomi. To find your audience id, in your Mailchimp account, navigte to Audience → Manage audience → Settings → Audience name and default → Audience ID
organization_user_idto identify and link your contacts on both platforms.
merge tagproperty when updating a contact. Hence consent events are mapped to the merge tag of Mailchimp contacts.
upsert_modeto true. Otherwise, when a consent is collected but the
organization_user_idvalue does not match with any contact in Mailchimp, the consent update will not be propagated to Mailchimp.