If you're using Outbank on various platforms ( iOS / macOS / Android /  Windows 11 / Amazon FireOS) and want to utilize your subscription on all your devices, there's no need to purchase it separately in each app store. You can easily link your purchased Outbank subscription with your Outbank ID. If you don't have an Outbank ID yet, you can create one on the device where you made the subscription purchase:
'Settings' > 'Outbank ID' > 'create Outbank ID or login' > enter your E-Mail address

Once you've created or linked your Outbank ID, sign in with the same Outbank ID on all your other devices to activate your ongoing subscription.

If you're using Outbank on multiple devices within the same platform (e.g., on both an iPhone and iPad), you can also restore your purchase using your App Store Account.