You can also add tags to multiple tickets with the [Update Many Tickets](/api-reference/ticketing/tickets/tickets/#update-many-tickets) endpoint. #### Safe Update If the same ticket is updated by multiple API requests at the same time, some tags could be lost because of ticket update collisions. Include `updated_stamp` and `safe_update` properties in the request body to make a safe update. For `updated_stamp`, retrieve and specify the ticket's latest `updated_at` timestamp. The tag update only occurs if the `updated_stamp` timestamp matches the ticket's actual `updated_at` timestamp at the time of the request. If the timestamps don't match (in other words, if the ticket was updated since you retrieved the ticket's last `updated_at` timestamp), the request returns a 409 Conflict error. #### Example ```js { "tags": ["customer"], "updated_stamp":"2019-09-12T21:45:16Z", "safe_update":"true" } ``` For de