diff --git a/bookshop/srv/ord-service.mjs b/bookshop/srv/ord-service.mjs
index 92633615..042b5cf1 100644
--- a/bookshop/srv/ord-service.mjs
+++ b/bookshop/srv/ord-service.mjs
@@ -10,10 +10,11 @@ export class OrdService extends cds.ApplicationService {
     /**
      * Just an example to do something with id, if given.
      * Try it out with URLs like that:
-     * http://localhost:4004/ord/v1/documents
-     * http://localhost:4004/ord/v1/documents/CatalogService
-     * http://localhost:4004/ord/v1/documents/CatalogService.Books
-     * http://localhost:4004/ord/v1/documents/CatalogService.Authors
+     *
+     * - http://localhost:4004/ord/v1/documents
+     * - http://localhost:4004/ord/v1/documents/CatalogService
+     * - http://localhost:4004/ord/v1/documents/CatalogService.Books
+     * - http://localhost:4004/ord/v1/documents/CatalogService.Authors
      */
     this.on('READ','csn', req => {
       let csn = cds.context?.model || cds.model
@@ -25,16 +26,17 @@ export class OrdService extends cds.ApplicationService {
     /**
      * Just an example to serve arbitrary content with a function.
      * Try it out with URLs like that:
-     * http://localhost:4004/ord/v1/api?service=CatalogService
-     * http://localhost:4004/ord/v1/api?service=CatalogService&format=edmx
-     * http://localhost:4004/ord/v1/api?service=CatalogService&format=edmx-v2
-     * http://localhost:4004/ord/v1/api?service=CatalogService&format=openapi
+     *
+     * - http://localhost:4004/ord/v1/api?service=CatalogService
+     * - http://localhost:4004/ord/v1/api?service=CatalogService&format=edmx
+     * - http://localhost:4004/ord/v1/api?service=CatalogService&format=edmx-v2
+     * - http://localhost:4004/ord/v1/api?service=CatalogService&format=openapi
      */
     this.on('api', req => {
       let csn = cds.context?.model || cds.model
-      let { service, format } = req.data
+      let { service, format = 'csn' } = req.data
       let { res } = req.http
-      if (!format) {
+      if (format === 'csn') {
         if (!service) return res.send(csn)
         service = csn.services[service]
         return res.send({ definitions: [ service, ...service.entities ] .reduce ((all,e) => {
@@ -48,6 +50,24 @@ export class OrdService extends cds.ApplicationService {
       return res.send(api)
     })
 
+    /**
+     * Example how to register arbitrary use the express app routes,
+     * and map them to our service's interface.
+     * Try it out with URLs like that:
+     *
+     * - http://localhost:4004/ord/v1/csn/CatalogService
+     * - http://localhost:4004/ord/v1/edmx/CatalogService
+     * - http://localhost:4004/ord/v1/openapi/CatalogService
+     * - http://localhost:4004/ord/v1/asyncapi/CatalogService
+     *
+     * NOTE: we add cds.middlewares.before to the route, which gives us all
+     * the context and auth handling, which is also available to CAP services.
+     */
+    cds.app.get (`${this.path}/:api?/:service?`, cds.middlewares.before, req => {
+      const { api, service } = req.params
+      return this.api (service, api)
+    })
+
     return super.init()
   }
-}
+}
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