aMember (site.php): Allow to switch payment system on resume subscription

site.php

<?php

/**
 * Allow to switch payment system on resume subscription
 */
Am_Di::getInstance()->hook->add(Am_Event::INVOICE_BEFORE_PAYMENT, function(Am_Event $e) {

    $invoice = $e->getInvoice();
    if ($invoice->data()->get(Invoice::ORIG_ID) && !$invoice->data()->get('skip-me')) {
        $invoice->data()->set('skip-me', 1);
        $invoice->paysys_id = null;
        $invoice->save();

        Am_Mvc_Response::redirectLocation($e->getDi()->url("pay/{$invoice->getSecureId('payment-link')}", false));
    }

});