def deactivate_subscription(self, subscription_type, subscription_key):
return self._update_subscription(subscription_type, subscription_key, False)<EOL>
**Description**
            Deactivate a subscription

        **Arguments**
            - subscription_type: Type of subscription. Valid options:
                - 'tag_update': Receive notification when new image is pushed
                - 'policy_eval': Receive notification when image policy status changes
                - 'vuln_update': Receive notification when vulnerabilities are added, removed or modified
            - subscription_key: Fully qualified name of tag to subscribe to. Eg. docker.io/library/alpine:latest