curl --request DELETE \
  --url https://www.chatbase.co/api/v1/chatbots/{chatbotId}/contacts/{contactId} \
  --header 'Authorization: Bearer <token>'

{
  "message": "Success",
  "data": {
    "id": "contact_internal_123",
    "external_id": "user_123",
    "name": "John Doe",
    "email": "john@example.com",
    "phonenumber": "+1234567890",
    "stripe_accounts": [
      {
        "label": "main",
        "stripe_id": "cus_123abc456",
        "stripe_email": "john@example.com"
      }
    ],
    "custom_attributes": {
      "department": "Sales",
      "subscription_tier": "Premium"
    },
    "created_at": 1704067200,
    "updated_at": 1704153600
  }
}