     var _cornerRadius: CGFloat = 5.0
     /// The corner radius for the field's border.
     /// Default is 5.0.
-    @objc public var cornerRadius: CGFloat {
+    @objc open var cornerRadius: CGFloat {
         get {
             _cornerRadius
         }


    @IBInspectable private var _cvcPlaceholder: String?
    /// The placeholder for the cvc field. Defaults to "CVC".
    @IBInspectable public var cvcPlaceholder: String? {
        get {
            _cvcPlaceholder
        }

    /// object is to make changes to a `STPPaymentMethodCardParams` you own (retrieved from this text field if desired),
    /// and then set this property to the new value.

    @objc open var cardParams: STPPaymentMethodCardParams {
        get {
            let newParams = internalCardParams.copy() as! STPPaymentMethodCardParams
            newParams.number = cardNumber
