diff --git a/htdocs/commande/class/api_orders.class.php b/htdocs/commande/class/api_orders.class.php
index cc7db3db852..d53634a4e08 100644
--- a/htdocs/commande/class/api_orders.class.php
+++ b/htdocs/commande/class/api_orders.class.php
@@ -456,6 +456,40 @@ class Orders extends DolibarrApi
         }
     }
 
+    /**
+     * Get contacts of given order
+     *
+     * Return an array with contact informations
+     *
+     * @param int    $id   ID of order
+	 * @param string $type Type of the contact (BILLING, SHIPPING, CUSTOMER)
+     *
+     * @url	GET {id}/contacts
+     *
+     * @return 	array data without useless information
+     *
+     * @throws 	RestException
+     */
+    public function getContacts($id, $type = '')
+    {
+        if (! DolibarrApiAccess::$user->rights->commande->lire) {
+            throw new RestException(401);
+        }
+
+        $result = $this->commande->fetch($id);
+        if ( ! $result ) {
+            throw new RestException(404, 'Order not found');
+        }
+
+        if ( ! DolibarrApi::_checkAccessToResource('commande', $this->commande->id)) {
+            throw new RestException(401, 'Access not allowed for login '.DolibarrApiAccess::$user->login);
+        }
+
+        $contacts = $this->commande->liste_contact(-1, 'external', 0, $type);
+
+        return $this->_cleanObjectDatas($contacts);
+    }
+
     /**
 	 * Add a contact type of given order
 	 *
@@ -487,15 +521,24 @@ class Orders extends DolibarrApi
 
         $result = $this->commande->add_contact($contactid, $type, 'external');
 
-        if (!$result) {
+        if ($result < 0) {
             throw new RestException(500, 'Error when added the contact');
         }
 
-        return $this->commande;
+        if ($result == 0) {
+            throw new RestException(304, 'contact already added');
+        }
+
+        return array(
+            'success' => array(
+                'code' => 200,
+                'message' => 'Contact linked to the order'
+            )
+        );
     }
 
     /**
-	 * Delete a contact type of given order
+	 * Unlink a contact type of given order
 	 *
 	 * @param int    $id             Id of order to update
 	 * @param int    $rowid          Row key of the contact in the array contact_ids.
@@ -510,26 +553,31 @@ class Orders extends DolibarrApi
 	 */
     public function deleteContact($id, $rowid)
     {
-        if (!DolibarrApiAccess::$user->rights->commande->creer) {
+        if (! DolibarrApiAccess::$user->rights->commande->creer) {
 			throw new RestException(401);
 		}
 
         $result = $this->commande->fetch($id);
-        if (!$result) {
+        if (! $result) {
             throw new RestException(404, 'Order not found');
         }
 
-		if (!DolibarrApi::_checkAccessToResource('commande', $this->commande->id)) {
+		if (! DolibarrApi::_checkAccessToResource('commande', $this->commande->id)) {
 			throw new RestException(401, 'Access not allowed for login '.DolibarrApiAccess::$user->login);
 		}
 
-        $result = $this->commande->delete_contact($rowid);
+        $result = $this->commande->delete_linked_contact($rowid);
 
         if (!$result) {
             throw new RestException(500, 'Error when deleted the contact');
         }
 
-        return $this->commande;
+        return array(
+            'success' => array(
+                'code' => 200,
+                'message' => 'Contact unlinked from order'
+            )
+        );
     }
 
     /**