Unlock premium content after successful transaction - SwiftUI

Hey everyone,

I am struggling how to unlock premium content after successful transaction. Based on docs and github a came up with :

            Purchases.shared.getCustomerInfo { (info, error) in

                guard let info = info, error == nil else { return }

                if info.entitlements.all["allaccess"]?.isActive == true{

                    //pro content here

                } else {

                    //free content

                }

            }

        }

but it throws errors at does not seems like to work.

I have RC 4.0.0

Thanks for helping:)