is there any new solution to the problem "how to track multiple events at the same time"?
Ecommerce website, payment step. The user tick the "register as a new user" checkbox and confirm his purchase. The user lands on the ThankYou page where we get the confirmation both user_register and purchase events.
As far as I know tealium_event property doesn't allow multiple values so, how can I trigger:
Including the uid_array parameter will ensure that the specified tag(s) - and only those tags - are fired during that call. In your case, you could use the default utag.view to trigger the first round of events, and then use this method to specifically call the tags that need to fire an additional event. That is probably the easiest solution for this type of scenario.
(Please note that this will bypass any load rules on the tag, so you will need to be sure of your logic if you hardcode the UID's into the view/link call in this way. Also note that you will need to ensure any required data is included as the first parameter in the view/link call, as the page data will not be passed by default.)