diff --git a/commerce_coupon.install b/commerce_coupon.install
index c4d538cddf2a765a3ebb8e3e4a26de9572f83444..a244701f2f5fd83931c5fd2e0e22940d5ef37b9f 100644
--- a/commerce_coupon.install
+++ b/commerce_coupon.install
@@ -130,6 +130,7 @@ function commerce_coupon_uninstall() {
   variable_del('commerce_coupon_default_code_size');
   variable_del('commerce_coupon_checkout_pane_view');
   variable_del('commerce_coupon_review_pane_view');
+  variable_del('commerce_coupon_checkout_enable_add_button');
 }
 
 /**
diff --git a/includes/commerce_coupon.checkout_pane.inc b/includes/commerce_coupon.checkout_pane.inc
index 6f8386c40deb70ed0cfcdbcec70846c86ab01147..b915639629fe278025b922635f9cfe99451fb6a4 100644
--- a/includes/commerce_coupon.checkout_pane.inc
+++ b/includes/commerce_coupon.checkout_pane.inc
@@ -12,7 +12,11 @@
  * Payment pane: form callback.
  */
 function commerce_coupon_pane_checkout_form($form, &$form_state, $checkout_pane, $order) {
-  $pane_form = array();
+  // Allow to replace pane content with ajax calls.
+  $pane_form = array(
+    '#prefix' => '<div id="commerce-checkout-coupon-ajax-wrapper">',
+    '#suffix' => '</div>',
+  );
 
   // Store the payment methods in the form for validation purposes.
   $pane_form['coupon_code'] = array(
@@ -20,6 +24,20 @@ function commerce_coupon_pane_checkout_form($form, &$form_state, $checkout_pane,
     '#title' => t('Coupon Code'),
     '#description' => t('Enter here your coupon code.'),
   );
+
+  if (variable_get('commerce_coupon_checkout_enable_add_button', TRUE)) {
+    $pane_form['coupon_add'] = array(
+      '#type' => 'button',
+      '#value' => t('Add coupon'),
+      '#name' => 'coupon_add',
+      '#limit_validation_errors' => array(),
+      '#ajax' => array(
+        'callback' => 'commerce_coupon_add_coupon_callback',
+        'wrapper' => 'commerce-checkout-coupon-ajax-wrapper',
+      ),
+    );
+  }
+
   // Extract the View and display keys from the cart contents pane setting.
   $pane_view = variable_get('commerce_coupon_checkout_pane_view', 'commerce_coupon_review_pane|default');
   if ($pane_view <> 'none') {
@@ -32,6 +50,54 @@ function commerce_coupon_pane_checkout_form($form, &$form_state, $checkout_pane,
     }
   }
 
+  if (isset($form_state['triggering_element']) && $form_state['triggering_element']['#name'] == 'coupon_add') {
+    if (!empty($form_state['values']['commerce_coupon']['coupon_add'])) {
+      list($view_id, $display_id) = explode('|', variable_get('commerce_coupon_review_pane_view', 'commerce_coupon_review_pane|default'));
+      if (!empty($view_id) && !empty($display_id)) {
+        global $_commerce_coupon_validation_error_message;
+        $code = $form_state['input']['commerce_coupon']['coupon_code'];
+        if (!empty($code) && commerce_coupon_code_is_valid($code, $order)) {
+          $coupon = commerce_coupon_load_by_code($code);
+          commerce_coupon_redeem_coupon($coupon, $order);
+
+          // Clear the field value so that the coupon code does not get resubmitted
+          // causing an error when user uses main "Continue to next step" submit.
+          $pane_form['coupon_code']['#value'] = '';
+
+          if (isset($order->order_id) && is_numeric($order->order_id)) {
+            // This is to get the summary of the form rerendered.
+            $alter_coupon_commands = &drupal_static('alter_coupon_commands');
+            $coupon_current_order = &drupal_static('coupon_current_order');
+            $alter_coupon_commands = TRUE;
+            $coupon_current_order = $order->order_id;
+          }
+          // Force shopping cart refresh to recalculate all prices there,
+          // which is not done automatically in case of percentage coupons.
+          commerce_cart_order_refresh($order);
+          $pane_form['redeemed_coupons']['#markup'] = commerce_embed_view($view_id, $display_id, array($order->order_id));
+        }
+        else {
+          if (isset($_commerce_coupon_validation_error_message)) {
+            $message = $_commerce_coupon_validation_error_message;
+          }
+          else {
+            $message = t('Your coupon code is not valid.');
+          }
+          form_set_error('commerce_coupon][coupon_code', $message);
+        }
+      }
+    }
+  }
+
+  // Display any new status messages added by this pane within the pane's area.
+  if (drupal_get_messages(NULL, FALSE)) {
+    $pane_form['status_messages'] = array(
+      '#type' => 'markup',
+      '#markup' => theme('status_messages'),
+      '#weight' => -1,
+    );
+  }
+
   return $pane_form;
 }
 
@@ -72,6 +138,38 @@ function commerce_coupon_pane_checkout_form_submit($form, &$form_state, $checkou
   if (!form_get_errors() && $code = $form_state['values']['commerce_coupon']['coupon_code']) {
     $commerce_coupon = commerce_coupon_load_by_code($code);
     commerce_coupon_redeem_coupon($commerce_coupon, $order);
+    // Rebuild the form only if "Add coupon" ajax submit was used
+    // and we're still staying on the same page.
+    if (isset($form_state['triggering_element']) && $form_state['triggering_element']['#name'] == 'coupon_add') {
+      $form_state['rebuild'] = TRUE;
+    }
+  }
+}
+
+/**
+ * Callback for the ajax button coupon_add.
+ */
+function commerce_coupon_add_coupon_callback($form, &$form_state) {
+  return $form['commerce_coupon'];
+}
+
+/**
+ * Implements hook_ajax_render_alter().
+ *
+ * This is to get the summary of the cart to rerender on the add coupon button.
+ */
+function commerce_coupon_ajax_render_alter(&$commands) {
+  $alter_coupon_commands = &drupal_static('alter_coupon_commands');
+  $coupon_current_order = &drupal_static('coupon_current_order');
+
+  if ($alter_coupon_commands) {
+    list($view_id, $display_id) = explode('|', variable_get('commerce_cart_contents_pane_view', 'commerce_cart_summary|default'));
+    $contents = array();
+    $contents['cart_contents_view'] = array(
+      '#markup' => commerce_embed_view($view_id, $display_id, array($coupon_current_order)),
+    );
+    $contents = drupal_render($contents);
+    $commands[] = ajax_command_replace('.view-commerce-cart-summary', $contents);
   }
 }
 
@@ -79,7 +177,7 @@ function commerce_coupon_pane_checkout_form_submit($form, &$form_state, $checkou
  * Implements the callback for the checkout pane review form
  */
 function commerce_coupon_pane_review($form, $form_state, $checkout_pane, $order) {
-  if(!empty($order->commerce_coupon_order_reference)) {
+  if (!empty($order->commerce_coupon_order_reference)) {
     // Extract the View and display keys from the cart contents pane setting.
     list($view_id, $display_id) = explode('|', variable_get('commerce_coupon_review_pane_view', 'commerce_coupon_review_pane|default'));
 
@@ -122,5 +220,12 @@ function commerce_coupon_pane_settings_form($checkout_pane) {
     '#default_value' => variable_get('commerce_coupon_review_pane_view', 'commerce_coupon_review_pane|default'),
   );
 
+  $form['commerce_coupon_checkout_enable_add_button'] = array(
+    '#type' => 'checkbox',
+    '#title' => t('Enable <em>Add coupon</em> button'),
+    '#description' => t('Enabling <em>Add coupon</em> button provides option to add multiple coupon codes from <em>Coupons</em> checkout pane.'),
+    '#default_value' => variable_get('commerce_coupon_checkout_enable_add_button', TRUE),
+  );
+
   return $form;
 }