Transaction Notifications / Webhooks

I’m working on integrating Akoya with sandbox credentials. I’m trying to determine whether I have to poll Akoya for account updates, like new/updated transactions, or if that is something the subscriptions/notification/content APIs can handle via webhooks. I see there are a few mentions of webhooks on the docs site, but I am struggling to find pertinent examples… Perhaps I'm misunderstanding the purpose of the subscriptions / notifications endpoints... I see examples for scheduled maintenance type notifications, but I'm specifically look for transaction/account notifications.

Our project also integrates with Plaid, so I’m trying to determine if we’ll be notified of transaction updates via webhooks in a similar capacity, or need to manually request that data.

Thanks!