diff --git a/fulcrm_shoppingcart.module b/fulcrm_shoppingcart.module
index bd70e17..f252f72 100644
--- a/fulcrm_shoppingcart.module
+++ b/fulcrm_shoppingcart.module
@@ -499,6 +499,35 @@ function fulcrm_shoppingcart_event_has_capacity( $event_id ) {
     return TRUE;
 }
 
+function fulcrm_shoppingcart_eventslot_has_capacity( $eventslot_id ) {
+    $capacity = null;
+    $count = null;
+    $api_data = fulcrm_apiv2_GET( 'eventslot/' . $event_id . '/',
+                                  $query = array( 'expand' => 'eventpart,eventpart.event' ) );
+    if ( $api_data[ 'success' ] ) {
+        $capacities = array( $api_data[ 'data' ][ 'eventpart' ][ 'event' ][ 'capacity' ],
+                             $api_data[ 'data' ][ 'eventpart' ][ 'capacity' ],
+                             $api_data[ 'data' ][ 'capacity' ] );
+        foreach ( $capacities as $cap ) {
+            if ( !is_null( $cap ) )
+                $capacity = $cap;
+        }
+    }
+
+    $api_data = fulcrm_apiv2_GET( 'eventslotbooking/', $query = array( 'eventslot' => $eventslot_id,
+                                                                       'eventbooking__confirmed__isnull' => 'False',
+                                                                       'eventbooking__cancelled__isnull' => 'True',
+                                                                       ) );
+    if ( $api_data[ 'success' ] )
+        $count = $api_data[ 'data' ][ 'count' ];
+
+    if ( !is_null( $capacity ) && !is_null( $count ) ) {
+        if ( $count >= $capacity )
+            return FALSE;
+    }
+    return TRUE;
+}
+
 function fulcrm_shoppingcart_buy_eventbookingtype_form( $form, &$form_state, $person, $eventbookingtype, $product ) {
     $form = array();