diff --git a/packages/app-next/package.json b/packages/app-next/package.json
index 635a513c0f..71d888ee50 100644
--- a/packages/app-next/package.json
+++ b/packages/app-next/package.json
@@ -12,6 +12,7 @@
     "@backstage/cli": "workspace:^",
     "@backstage/config": "workspace:^",
     "@backstage/core-app-api": "workspace:^",
+    "@backstage/core-compat-api": "workspace:^",
     "@backstage/core-components": "workspace:^",
     "@backstage/core-plugin-api": "workspace:^",
     "@backstage/frontend-app-api": "workspace:^",
diff --git a/packages/app-next/src/App.tsx b/packages/app-next/src/App.tsx
index d64c4dbb15..5e9205e2c4 100644
--- a/packages/app-next/src/App.tsx
+++ b/packages/app-next/src/App.tsx
@@ -27,6 +27,7 @@ import homePlugin, {
 import {
   coreExtensionData,
   createExtension,
+  createApiExtension,
   createExtensionOverrides,
   createPageExtension,
 } from '@backstage/frontend-plugin-api';
@@ -34,6 +35,16 @@ import { entityRouteRef } from '@backstage/plugin-catalog-react';
 import techdocsPlugin from '@backstage/plugin-techdocs/alpha';
 import { convertLegacyRouteRef } from '@backstage/core-plugin-api/alpha';
 import { homePage } from './HomePage';
+import { collectLegacyRoutes } from '@backstage/core-compat-api';
+import { FlatRoutes } from '@backstage/core-app-api';
+import { Route } from 'react-router';
+import { CatalogImportPage } from '@backstage/plugin-catalog-import';
+import { createApiFactory, configApiRef } from '@backstage/core-plugin-api';
+import {
+  ScmAuth,
+  ScmIntegrationsApi,
+  scmIntegrationsApiRef,
+} from '@backstage/integration-react';
 
 /*
 
@@ -83,6 +94,24 @@ const homePageExtension = createExtension({
   },
 });
 
+const scmAuthExtension = createApiExtension({
+  factory: ScmAuth.createDefaultApiFactory(),
+});
+
+const scmIntegrationApi = createApiExtension({
+  factory: createApiFactory({
+    api: scmIntegrationsApiRef,
+    deps: { configApi: configApiRef },
+    factory: ({ configApi }) => ScmIntegrationsApi.fromConfig(configApi),
+  }),
+});
+
+const collectedLegacyRoutes = collectLegacyRoutes(
+  <FlatRoutes>
+    <Route path="/catalog-import" element={<CatalogImportPage />} />
+  </FlatRoutes>,
+);
+
 const app = createApp({
   features: [
     graphiqlPlugin,
@@ -92,7 +121,13 @@ const app = createApp({
     userSettingsPlugin,
     homePlugin,
     createExtensionOverrides({
-      extensions: [entityPageExtension, homePageExtension],
+      extensions: [
+        entityPageExtension,
+        homePageExtension,
+        scmAuthExtension,
+        scmIntegrationApi,
+        ...collectedLegacyRoutes,
+      ],
     }),
   ],
   /* Handled through config instead */
diff --git a/packages/core-compat-api/src/collectLegacyRoutes.tsx b/packages/core-compat-api/src/collectLegacyRoutes.tsx
index b40ae78439..ea235d57a6 100644
--- a/packages/core-compat-api/src/collectLegacyRoutes.tsx
+++ b/packages/core-compat-api/src/collectLegacyRoutes.tsx
@@ -15,13 +15,18 @@
  */
 
 import React, { ReactNode } from 'react';
-import { Extension, createPageExtension } from '@backstage/frontend-plugin-api';
+import {
+  Extension,
+  createApiExtension,
+  createPageExtension,
+} from '@backstage/frontend-plugin-api';
 import { Route, Routes } from 'react-router-dom';
 import {
   BackstagePlugin,
   RouteRef,
   getComponentData,
 } from '@backstage/core-plugin-api';
+import { convertLegacyRouteRef } from '@backstage/core-plugin-api/alpha';
 
 export function collectLegacyRoutes(
   flatRoutesElement: JSX.Element,
@@ -77,7 +82,7 @@ export function collectLegacyRoutes(
       const detectedExtension = createPageExtension({
         id: `plugin.${pluginId}.page`,
         defaultPath: path[0] === '/' ? path.slice(1) : path,
-        routeRef,
+        routeRef: routeRef ? convertLegacyRouteRef(routeRef) : undefined,
 
         loader: async () =>
           route.props.children ? (
@@ -91,7 +96,13 @@ export function collectLegacyRoutes(
           ),
       });
 
-      plugin.getApis(); // Create DI API extensions from these
+      results.push(
+        ...Array.from(plugin.getApis()).map(factory =>
+          createApiExtension({
+            factory,
+          }),
+        ),
+      );
 
       // TODO: Create converted plugin instance instead. We need to move over APIs etc.
       results.push(detectedExtension);
diff --git a/packages/core-compat-api/src/index.ts b/packages/core-compat-api/src/index.ts
index 4b9026cde5..2181b2fa9a 100644
--- a/packages/core-compat-api/src/index.ts
+++ b/packages/core-compat-api/src/index.ts
@@ -13,4 +13,4 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-export {};
+export { collectLegacyRoutes } from './collectLegacyRoutes';
diff --git a/yarn.lock b/yarn.lock
index 1c101630dc..f06b7b486d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3952,7 +3952,7 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@backstage/core-compat-api@workspace:packages/core-compat-api":
+"@backstage/core-compat-api@workspace:^, @backstage/core-compat-api@workspace:packages/core-compat-api":
   version: 0.0.0-use.local
   resolution: "@backstage/core-compat-api@workspace:packages/core-compat-api"
   dependencies:
@@ -25274,6 +25274,7 @@ __metadata:
     "@backstage/cli": "workspace:^"
     "@backstage/config": "workspace:^"
     "@backstage/core-app-api": "workspace:^"
+    "@backstage/core-compat-api": "workspace:^"
     "@backstage/core-components": "workspace:^"
     "@backstage/core-plugin-api": "workspace:^"
     "@backstage/frontend-app-api": "workspace:^"