Superwall integration: Identifying users

Hey, I am setting up Revenue Cat together with Superwall. I now created a custom purchase controller for superwall, according to their docs, that basically uses the RC SDK to handle purchases. I now want to identify users using our internal user UUID. The goal is that a subscription is tied to a user account and is active as soon as a user logs in on a new device. Do I have to login on Superwall AND RC? Or is Superwall enough and the information is passed on to RC?

In Flutter code:
 

// This?

Superwall.shared.identify(user.id);

await Purchases.logIn(user.id);

Or just this?

Superwall.shared.identify(user.id);

Thanks!