How do I become the admin for users with trial accounts so that I can manage the monthly subscription payment?

In StoriesOnBoard one subscription belongs to one workspace. If you'd like to manage one subscription then please move the maps into one workspace. There's a short guide on how to do it here: under "Move story maps between workspaces" heading.

The maps can be separated with permissions within the workspace, they don't need to be accessible (or even seen) by everyone.

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