---- error ----

AuthorizeNetARB_Response Object
(
    [xml] => SimpleXMLElement Object
        (
            [messages] => SimpleXMLElement Object
                (
                    [resultCode] => Error
                    [message] => SimpleXMLElement Object
                        (
                            [code] => E00012
                            [text] => You have submitted a duplicate of Subscription 2391150. A duplicate subscription will not be created.
                        )

                )

        )

    [response] => ´╗┐ErrorE00012You have submitted a duplicate of Subscription 2391150. A duplicate subscription will not be created.
    [xpath_xml] => SimpleXMLElement Object
        (
            [messages] => SimpleXMLElement Object
                (
                    [resultCode] => Error
                    [message] => SimpleXMLElement Object
                        (
                            [code] => E00012
                            [text] => You have submitted a duplicate of Subscription 2391150. A duplicate subscription will not be created.
                        )

                )

        )

)
--- success ---

AuthorizeNetARB_Response Object
(
    [xml] => SimpleXMLElement Object
        (
            [messages] => SimpleXMLElement Object
                (
                    [resultCode] => Ok
                    [message] => SimpleXMLElement Object
                        (
                            [code] => I00001
                            [text] => Successful.
                        )

                )

            [subscriptionId] => 2391152
        )

    [response] => ´╗┐OkI00001Successful.2391152
    [xpath_xml] => SimpleXMLElement Object
        (
            [messages] => SimpleXMLElement Object
                (
                    [resultCode] => Ok
                    [message] => SimpleXMLElement Object
                        (
                            [code] => I00001
                            [text] => Successful.
                        )

                )

            [subscriptionId] => 2391152
        )

)