diff --git a/src/Mondu/Mondu/Api.php b/src/Mondu/Mondu/Api.php
index 55498b78..68e1ef7d 100644
--- a/src/Mondu/Mondu/Api.php
+++ b/src/Mondu/Mondu/Api.php
@@ -120,6 +120,18 @@ public function get_invoices($mondu_uuid) {
     return json_decode($result['body'], true);
   }
 
+    /**
+     * @param $mondu_order_uuid
+     * @param $mondu_invoice_uuid
+     * @return string
+     * @throws MonduException
+     * @throws ResponseException
+     */
+  public function get_invoice($mondu_order_uuid, $mondu_invoice_uuid) {
+    $result = $this->get(sprintf('/orders/%s/invoices/%s', $mondu_order_uuid, $mondu_invoice_uuid), null);
+    return json_decode($result['body'], true);
+  }
+
   /**
    * @return string
    * @throws MonduException
@@ -172,6 +184,18 @@ public function cancel_invoice($mondu_uuid, $mondu_invoice_uuid) {
     return json_decode($result['body'], true);
   }
 
+    /**
+     * @param $mondu_invoice_uuid
+     * @param array $credit_note
+     * @return mixed
+     * @throws MonduException
+     * @throws ResponseException
+     */
+  public function create_credit_note($mondu_invoice_uuid, array $credit_note) {
+      $result = $this->post(sprintf('/invoices/%s/credit_notes', $mondu_invoice_uuid), $credit_note);
+      return json_decode($result['body'], true);
+  }
+
   /**
    * @param $path
    * @param array|string|null $body
diff --git a/src/Mondu/Mondu/Gateway.php b/src/Mondu/Mondu/Gateway.php
index dd65e306..e68e8add 100644
--- a/src/Mondu/Mondu/Gateway.php
+++ b/src/Mondu/Mondu/Gateway.php
@@ -173,21 +173,26 @@ public function order_status_changed($order_id, $from_status, $to_status) {
    * @throws MonduException
    * @throws ResponseException
    */
-  // public function order_refunded($order_id, $refund_id) {
-  //   $order         = new WC_Order($order_id);
-  //   $refund        = new WC_Order_Refund($refund_id);
-  //   $mondu_order_id = get_post_meta($order->get_id(), Plugin::ORDER_ID_KEY, true);
-
-  //   $order_total      = $order->get_total();
-  //   $order_total_tax  = $order->get_total_tax();
-  //   $refund_total     = $refund->get_total();
-  //   $refund_total_tax = $refund->get_total_tax();
-  //   $new_amount       = [
-  //     'net'   => ($order_total - $order_total_tax) + ($refund_total - $refund_total_tax),
-  //     'gross' => ($order_total) + ($refund_total),
-  //     'tax'   => ($order_total_tax) + ($refund_total_tax),
-  //  ];
-
-  //   $this->api->updateOrder($mondu_order_id, ['amount' => $new_amount]);
-  // }
+   public function order_refunded($order_id, $refund_id) {
+      $order = new WC_Order($order_id);
+
+      if ($order->get_payment_method() !== 'mondu') {
+         return;
+      }
+
+      $refund = new WC_Order_Refund($refund_id);
+      $mondu_invoice_id = get_post_meta($order->get_id(), PLUGIN::INVOICE_ID_KEY, true);
+
+      if(!$mondu_invoice_id) {
+         throw new ResponseException('Mondu: Can\'t create a credit note without an invoice');
+      }
+
+      $refund_total = $refund->get_total();
+      $credit_note = [
+         'gross_amount_cents' => abs(round ((float) $refund_total * 100)),
+         'external_reference_id' => (string) $refund->get_id()
+      ];
+
+      $this->api->create_credit_note($mondu_invoice_id, $credit_note);
+   }
 }
diff --git a/src/Mondu/Mondu/MonduRequestWrapper.php b/src/Mondu/Mondu/MonduRequestWrapper.php
index 1f2ee191..eb18a4d8 100644
--- a/src/Mondu/Mondu/MonduRequestWrapper.php
+++ b/src/Mondu/Mondu/MonduRequestWrapper.php
@@ -144,4 +144,24 @@ public function get_invoices($order_id) {
     $response = $this->api->get_invoices($mondu_order_id);
     return $response['invoices'];
   }
+
+    /**
+     * @param $invoice_id
+     * @return mixed | void
+     * @throws MonduException
+     * @throws ResponseException
+     */
+  public function get_invoice($order_id) {
+    $order = new WC_Order($order_id);
+    if ($order->get_payment_method() !== 'mondu') {
+      return;
+    }
+
+    $mondu_order_id = get_post_meta($order_id, Plugin::ORDER_ID_KEY, true);
+    $mondu_invoice_id = get_post_meta($order_id, Plugin::INVOICE_ID_KEY, true);
+
+    $response = $this->api->get_invoice($mondu_order_id, $mondu_invoice_id);
+
+    return @$response['invoice'];
+  }
 }
diff --git a/src/Mondu/Mondu/Presenters/PaymentInfo.php b/src/Mondu/Mondu/Presenters/PaymentInfo.php
index 760d58d3..ec1fc18a 100644
--- a/src/Mondu/Mondu/Presenters/PaymentInfo.php
+++ b/src/Mondu/Mondu/Presenters/PaymentInfo.php
@@ -107,32 +107,56 @@ public function get_mondu_section_html() {
     return ob_get_clean();
   }
 
-  public function get_mondu_invoice_html($orderId = null) {
-    $invoice_data = $this->get_invoices();
+  public function get_mondu_invoice_html($mondu_order_id = null) {
+    $invoice_data = $this->get_invoice();
 
     ob_start();
 
-    foreach ($invoice_data as $key => $invoice_data) {
+      if($invoice_data) {
+          $currency = $invoice_data['order']['currency'];
       ?>
         <hr>
         <p>
-           <span><strong><?php printf(__('Invoice state:', 'mondu')); ?></strong></span>
+          <span><strong><?php printf(__('Invoice state:', 'mondu')); ?></strong></span>
           <?php printf($invoice_data['state']) ?>
         </p>
         <p>
-           <span><strong><?php printf(__('Invoice number:', 'mondu')); ?></strong></span>
+          <span><strong><?php printf(__('Invoice number:', 'mondu')); ?></strong></span>
           <?php printf($invoice_data['invoice_number']) ?>
         </p>
         <p>
-            <span><strong>Total</strong></span>
-          <?php printf($invoice_data['gross_amount_cents']/100) ?>
+          <span><strong><?php printf(__('Total:', 'mondu')); ?></strong></span>
+          <?php printf('%s %s', ($invoice_data['gross_amount_cents'] / 100), $currency) ?>
         </p>
         <p>
-           <span><strong><?php printf(__('Paid out:', 'mondu')); ?></strong></span>
+          <span><strong><?php printf(__('Paid out:', 'mondu')); ?></strong></span>
           <?php printf($invoice_data['paid_out'] ? 'Yes' : 'No') ?>
         </p>
-        <button <?php $invoice_data['state'] === 'canceled' ? printf('disabled') : ''?> data-mondu='<?php echo(json_encode(['invoice_id' => $invoice_data['uuid'], 'order_id' => $orderId])) ?>' id="mondu-cancel-invoice-button" type="submit" class="button grant_access">
-            Cancel Invoice
+        <div>
+            <?php
+                if($invoice_data['credit_notes']) {
+                    printf('<hr>');
+                }
+                foreach ($invoice_data['credit_notes'] as $note) {
+                    ?>
+                        <p>
+                            <span>
+                                <strong><?php printf(__('Credit Note number', 'mondu')); ?></strong>
+                                <?php printf($note['external_reference_id']) ?>
+                            </span>
+                        </p>
+                        <p>
+                            <span>
+                                <strong><?php printf(__('Total: ', 'mondu')); ?></strong>
+                                <?php printf('%s %s', ($note['gross_amount_cents'] / 100), $currency) ?>
+                            </span>
+                        </p>
+                    <?php
+                }
+            ?>
+        </div>
+        <button <?php $invoice_data['state'] === 'canceled' ? printf('disabled') : ''?> data-mondu='<?php echo(json_encode(['invoice_id' => $invoice_data['uuid'], 'order_id' => $mondu_order_id])) ?>' id="mondu-cancel-invoice-button" type="submit" class="button grant_access">
+            <?php printf(__('Cancel Invoice', 'mondu')); ?>
         </button>
       <?php
     }
@@ -147,6 +171,14 @@ private function get_invoices() {
     }
   }
 
+  private function get_invoice() {
+      try {
+          return $this->mondu_request_wrapper->get_invoice($this->order->get_id());
+      } catch (ResponseException $e) {
+          return false;
+      }
+  }
+
   private function get_order() {
     try {
       return $this->mondu_request_wrapper->get_order($this->order->get_id());
diff --git a/src/Mondu/Plugin.php b/src/Mondu/Plugin.php
index 1960c4bc..35c75a6d 100644
--- a/src/Mondu/Plugin.php
+++ b/src/Mondu/Plugin.php
@@ -68,7 +68,7 @@ public function init() {
 
     add_action('woocommerce_before_order_object_save', [new Gateway(), 'update_order_if_changed_some_fields'], 10, 2);
 
-    // add_action('woocommerce_order_refunded', [new Gateway(), 'order_refunded'], 10, 2);
+    add_action('woocommerce_order_refunded', [new Gateway(), 'order_refunded'], 10, 2);
 
     add_action('rest_api_init', function () {
       $orders = new OrdersController();