static func configure(withAPIKey : String, appUserID : String?) -> Purchases Configures an instance of the Purchases SDK with a specified API key and app user ID.
static func configure(withAPIKey : String, appUserID : String?, observerMode : Bool) -> Purchases Configures an instance of the Purchases SDK with a custom
UserDefaults .static func configure(withAPIKey : String, appUserID : String?, observerMode : Bool, userDefaults : UserDefaults ?) -> Purchases Configures an instance of the Purchases SDK with a custom
UserDefaults .