Webhooks

contact_unsubscribed

{
    "event": "contact_unsubscribed",
    "body": {
        "feed_id": 1,
        "email": "sam@domain.com",
        "contact_id": "32_hash_key",
        "campaign_id": 1, // Only when he unsubscribe from a campgin
        "reason": "hard_bounce", // Only if the email is not valid
    }
}