diff --git a/api/src/utils/market-app.utils.ts b/api/src/utils/market-app.utils.ts
index 283e28e6..f0b486d0 100644
--- a/api/src/utils/market-app.utils.ts
+++ b/api/src/utils/market-app.utils.ts
@@ -2,11 +2,23 @@ import {client} from '@contentstack/marketplace-sdk';
 import { DEVURLS } from '../constants/index.js';
 
 
-
+const buildMarketplaceClient = ({
+  authtoken,
+  region,
+}: {
+  authtoken?: string;
+  region?: string;
+}) => {
+  const host = DEVURLS?.[region as keyof typeof DEVURLS] ?? DEVURLS?.NA;
+  if (typeof authtoken === 'string' && authtoken.startsWith('Bearer ')) {
+    return client({ authorization: authtoken, host } as any);
+  }
+  return client({ authtoken, host } as any);
+};
 
 export const getAllApps = async ({ organizationUid, authtoken, region }: any) => {
   try {
-    const contentstackclient = client({ authtoken, host: DEVURLS?.[region] ?? DEVURLS?.NA });
+    const contentstackclient = buildMarketplaceClient({ authtoken, region });
     const data = await contentstackclient.marketplace(organizationUid).findAllApps();
     return data?.items;
   } catch (err) {
@@ -16,7 +28,7 @@ export const getAllApps = async ({ organizationUid, authtoken, region }: any) =>
 
 export const getAppManifestAndAppConfig = async ({ organizationUid, authtoken, region, manifestUid }: any) => {
   try {
-    const contentstackclient = client({ authtoken, host: DEVURLS?.[region] ?? DEVURLS?.NA });
+    const contentstackclient = buildMarketplaceClient({ authtoken, region });
     const data = await contentstackclient.marketplace(organizationUid).app(manifestUid).fetch();
     return data;
   } catch (err: any) {
@@ -56,13 +68,8 @@ export const fetchMarketplaceInstallationsForStack = async ({
   authtoken: string;
   region: string;
 }) => {
-  const host = DEVURLS?.[region as keyof typeof DEVURLS] ?? DEVURLS.NA;
-
   try {
-    const contentstackclient = client({
-      authtoken,
-      host,
-    });
+    const contentstackclient = buildMarketplaceClient({ authtoken, region });
     const instApi = contentstackclient
       .marketplace(organizationUid)
       .installation();
diff --git a/api/tests/unit/utils/market-app.utils.test.ts b/api/tests/unit/utils/market-app.utils.test.ts
index ac5b2ff4..d34a9161 100644
--- a/api/tests/unit/utils/market-app.utils.test.ts
+++ b/api/tests/unit/utils/market-app.utils.test.ts
@@ -74,6 +74,31 @@ describe('market-app.utils', () => {
       });
     });
 
+    it('routes SSO Bearer tokens to the SDK `authorization` option (not `authtoken`)', async () => {
+      // SSO callers historically forward a `Bearer <access_token>` string in
+      // the `authtoken` arg. Routing that into the SDK's `authtoken` option
+      // puts a Bearer value into the wrong HTTP header and Developer Hub
+      // rejects it, which is what caused marketplace-app custom fields to
+      // silently disappear from SSO migrations.
+      mockClient.marketplace.mockReturnValue({
+        findAllApps: vi.fn().mockResolvedValue({ items: [] }),
+      });
+
+      await getAllApps({
+        organizationUid: 'org-123',
+        authtoken: 'Bearer sso-access-token',
+        region: 'NA',
+      });
+
+      expect(marketplaceClient).toHaveBeenCalledWith({
+        authorization: 'Bearer sso-access-token',
+        host: 'developerhub-api.contentstack.com',
+      });
+      expect(marketplaceClient).not.toHaveBeenCalledWith(
+        expect.objectContaining({ authtoken: 'Bearer sso-access-token' }),
+      );
+    });
+
     it('should return undefined and log when error occurs', async () => {
       const consoleSpy = vi.spyOn(console, 'info').mockImplementation(() => {});
       mockClient.marketplace.mockReturnValue({
@@ -132,6 +157,26 @@ describe('market-app.utils', () => {
       expect(consoleSpy).toHaveBeenCalled();
       consoleSpy.mockRestore();
     });
+
+    it('routes SSO Bearer tokens to the SDK `authorization` option (not `authtoken`)', async () => {
+      mockClient.marketplace.mockReturnValue({
+        app: vi.fn().mockReturnValue({
+          fetch: vi.fn().mockResolvedValue({ uid: 'manifest-1' }),
+        }),
+      });
+
+      await getAppManifestAndAppConfig({
+        organizationUid: 'org-123',
+        authtoken: 'Bearer sso-access-token',
+        region: 'NA',
+        manifestUid: 'manifest-1',
+      });
+
+      expect(marketplaceClient).toHaveBeenCalledWith({
+        authorization: 'Bearer sso-access-token',
+        host: 'developerhub-api.contentstack.com',
+      });
+    });
   });
 
   describe('fetchMarketplaceInstallationsForStack', () => {
@@ -181,6 +226,25 @@ describe('market-app.utils', () => {
       expect(result).toEqual([matching]);
     });
 
+    it('routes SSO Bearer tokens to the SDK `authorization` option (not `authtoken`)', async () => {
+      const fetchAll = vi.fn().mockResolvedValue({ items: [] });
+      mockClient.marketplace.mockReturnValue({
+        findAllApps: vi.fn(),
+        app: vi.fn(),
+        installation: vi.fn(() => ({ fetchAll })),
+      });
+
+      await fetchMarketplaceInstallationsForStack({
+        ...baseParams,
+        authtoken: 'Bearer sso-access-token',
+      });
+
+      expect(marketplaceClient).toHaveBeenCalledWith({
+        authorization: 'Bearer sso-access-token',
+        host: 'developerhub-api.contentstack.com',
+      });
+    });
+
     it('uses fallback fetchAll() when paginated fetchAll rejects', async () => {
       const item = {
         uid: 'ins-fb',
diff --git a/upload-api/src/config/index.ts b/upload-api/src/config/index.ts
index 4bde1a7e..9722a13c 100644
--- a/upload-api/src/config/index.ts
+++ b/upload-api/src/config/index.ts
@@ -2,8 +2,11 @@ export default {
   plan: {
     dropdown: { optionLimit: 100 }
   },
+  // CMS type configuration
   cmsType: process.env.CMS_TYPE || 'cmsType',
   isLocalPath: true,
+
+  // AWS data configuration
   awsData: {
     awsRegion: 'us-east-2',
     awsAccessKeyId: '',
@@ -12,6 +15,8 @@ export default {
     bucketName: '',
     bucketKey: ''
   },
+
+  // Drupal database configuration
   mysql: {
     host: process.env.MYSQL_HOST || 'host_name',
     user: process.env.MYSQL_USER || 'user_name',
@@ -19,9 +24,13 @@ export default {
     database: process.env.MYSQL_DATABASE || 'database_name',
     port: process.env.MYSQL_PORT || 'port_number'
   },
+
+  // Drupal assets configuration
   assetsConfig: {
     base_url: process.env.DRUPAL_ASSETS_BASE_URL || 'drupal_assets_base_url',
     public_path: process.env.DRUPAL_ASSETS_PUBLIC_PATH || 'drupal_assets_public_path'
   },
+
+  // Local path for the CMS data
   localPath: process.env.CMS_LOCAL_PATH || process.env.CONTAINER_PATH || 'your_local_cms_data_path',
 };