I want authenticate iOS users with GameCenter. I should use secure options for security as described here. I Implemented Apple Add-On to my playfab title with 'Require secure authentication only for this app' option. And now, I don't know how to found PublicKeyUrl, Salt, Signature and Timestamp parameters in Unity to send PlayFab for authenticate user securely. Is there any instruction to get these parameters for the user logged in as GameCenter in unity?