Fix redirect for addfunds

This fixes addfunds requests somehow.

src/mollie/mollie.php

@@ -71,7 +71,7 @@ function mollie_link($params, $method = Mollie_API_Object_Method::IDEAL)
             return '<br/><img src="' . $params['systemurl'] . 'modules/gateways/mollie/ajax_loader.gif" /><br/>' . $_GATEWAYLANG['checkPayment'] . ' <script> window.onload = function(){ setTimeout("location.reload(true);", 2000); } </script>';
         }
     } else {
-        if (isset($_POST['start']) || (isset($_GET['a']) && $_GET['a'] == 'complete') || (isset($_GET['action']) && ($_GET['action'] == 'addfunds' || $_GET['action'] == 'masspay') && isset($_POST['paymentmethod']) && $_POST['paymentmethod'] == 'mollie' . $method)) {
+        if (isset($_POST['start']) || isset($_POST['issuer']) || (isset($_GET['a']) && $_GET['a'] == 'complete') || (isset($_GET['action']) && ($_GET['action'] == 'addfunds' || $_GET['action'] == 'masspay') && isset($_POST['paymentmethod']) && $_POST['paymentmethod'] == 'mollie' . $method)) {
 
             $transactionCurrency = select_query('tblcurrencies', '', array('code' => $params['currency']), null, null, 1);
             $transactionCurrency = mysql_fetch_assoc($transactionCurrency);
@@ -93,7 +93,7 @@ function mollie_link($params, $method = Mollie_API_Object_Method::IDEAL)
                 'method' => $method,
                 'description' => $params['description'],
                 'redirectUrl' => $params['returnurl'] . '&check_payment=' . $transactionId,
-                'webhookUrl' => $params['systemurl'] . 'modules/gateways/mollie/callback.php',
+                'webhookUrl' => $params['systemurl'] . '/modules/gateways/mollie/callback.php',
                 'metadata' => array(
                     'invoice_id' => $params['invoiceid'],
                 ),
@@ -105,7 +105,7 @@ function mollie_link($params, $method = Mollie_API_Object_Method::IDEAL)
             header('Location: ' . $payment->getCheckoutUrl());
             exit();
         } else {
-            $return = '<form action="" method="POST">';
+            $return = '<form action="viewinvoice.php?id=' . $params['invoiceid'] . '" method="POST">';
 
             if ($method == \Mollie\Api\Types\PaymentMethod::IDEAL) {
                 $issuers = $mollie->methods->get('ideal', ['include' => 'issuers'])->issuers;