If you're handling event registrations outside of HeySummit and want to direct attendees to that URL, you can use the Custom Checkout URL option.
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To access this feature, navigate to Setup > Update Event Settings.
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When attendees click on the upgrade, book my place, or register buttons within your event, they will be redirected to your custom checkout URL instead of the HeySummit checkout experience.

Note that this feature is available exclusively to users on the Success plan.