Globally unsubscribe a contact from all email marketing.
If the contact is already unsubscribed, this endpoint returns successfully without making changes.
Required scope: contacts_write
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Send either an API token or an OAuth access token as
Authorization: Bearer <token>. See the Authentication page for details.
The contact's unique identifier (returned as id in contact responses).
Optional reason for unsubscribing.
500"Contact requested removal from mailing list"
Contact unsubscribed successfully.