I want a GTM tag to run only after analytics consent. Which dataLayer event should the trigger listen for?
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Use a GTM Custom Event trigger with the event name optinstack_analytics_accepted. Similar events are available for marketing, preferences, necessary, and GPC detection. optinstack_consent_updated fires whenever the consent state changes and is useful when your tag needs to evaluate the complete choice object.
The category-specific *_accepted events fire once per page load for a grant. If consent is later denied, the accepted marker is cleared so a later grant can fire again in that session.
Documentation: Consent Mode dataLayer events and Runtime events.