Every credential you've connected is listed in the Manage keys modal in your project Settings, with its project bindings.
From there you can rename keys and revoke them: revoking asks you to type DELETE KEY to confirm, stops all syncing, and keeps your historical data. Artec can't delete the key on the provider's side, so also remove it in the provider's own dashboard.
If a key loses permissions (say, someone edits it in RevenueCat), you'll see an amber "needs attention" banner naming the missing permission. Fix the key with the provider and the connection heals itself on the next sync.