Custom Action live journey

​@Dex 666 You can't update the payload, authentication, headers, etc. on a custom action while it's still referenced/used within a journey — this restriction exists to prevent journeys from breaking mid-execution.
To make those changes, you first need to remove the custom action's references from the journey before updating the configuration.
Option 1: Remove the references, update the custom action directly, then re-add it to the journey.
Option 2: Duplicate the custom action under Administration → Configurations, apply your changes to the duplicate custom action, then duplicate the current journey and swap in the updated custom action within that duplicated journey.
Option 3 (for larger journeys): Select all activities in the journey, copy them, paste into a text editor, replace the custom action ID references there, then update the payload changes and paste back in.