diff --git a/src/modules/sso.ts b/src/modules/sso.ts
index ca6be3b..c947878 100644
--- a/src/modules/sso.ts
+++ b/src/modules/sso.ts
@@ -6,7 +6,6 @@ import { SsoModule } from "./sso.types";
  *
  * @param axios - Axios instance
  * @param appId - Application ID
- * @param userToken - User authentication token
  * @returns SSO module with authentication methods
  * @internal
  */
@@ -20,5 +19,11 @@ export function createSsoModule(
       const url = `/apps/${appId}/auth/sso/accesstoken/${userid}`;
       return axios.get(url);
     },
+
+    // Get the stored SSO OIDC ID token for a specific user
+    async getIdToken(userid: string) {
+      const url = `/apps/${appId}/auth/sso/idtoken/${userid}`;
+      return axios.get(url);
+    },
   };
 }
diff --git a/src/modules/sso.types.ts b/src/modules/sso.types.ts
index ecb7459..023bfb4 100644
--- a/src/modules/sso.types.ts
+++ b/src/modules/sso.types.ts
@@ -1,5 +1,3 @@
-import { AxiosResponse } from "axios";
-
 /**
  * Response from SSO access token endpoint.
  * @internal
@@ -11,9 +9,9 @@ export interface SsoAccessTokenResponse {
 /**
  * SSO (Single Sign-On) module for managing SSO authentication.
  *
- * This module provides methods for retrieving SSO access tokens for users.
- * These tokens allow you to authenticate Base44 users with external
- * systems or services.
+ * This module provides methods for retrieving SSO tokens for users. These
+ * tokens allow you to authenticate Base44 users with external systems or
+ * services.
  *
  * This module is only available to use with a client in service role authentication mode, which means it can only be used in backend environments.
  *
@@ -44,4 +42,29 @@ export interface SsoModule {
    * ```
    */
   getAccessToken(userid: string): Promise<SsoAccessTokenResponse>;
+
+  /**
+   * Gets the stored SSO OIDC ID token for the current app user.
+   *
+   * The service-role client must include an on-behalf-of token for the same
+   * user specified by `userid`. This method returns the stored token as-is and
+   * does not refresh it.
+   *
+   * @param userid - The current app user's ID.
+   * @returns Promise resolving to the raw ID-token string.
+   *
+   * @example
+   * ```typescript
+   * import { createClientFromRequest } from 'npm:@base44/sdk';
+   *
+   * Deno.serve(async (req) => {
+   *   const base44 = createClientFromRequest(req);
+   *   const user = await base44.auth.me();
+   *   const idToken = await base44.asServiceRole.sso.getIdToken(user.id);
+   *
+   *   return Response.json({ idToken });
+   * });
+   * ```
+   */
+  getIdToken(userid: string): Promise<string>;
 }
diff --git a/tests/unit/sso.test.ts b/tests/unit/sso.test.ts
new file mode 100644
index 0000000..04fe2c5
--- /dev/null
+++ b/tests/unit/sso.test.ts
@@ -0,0 +1,94 @@
+import { afterEach, beforeEach, describe, expect, test } from "vitest";
+import nock from "nock";
+import { createClient } from "../../src/index.ts";
+
+describe("SSO module", () => {
+  const appId = "test-app-id";
+  const serverUrl = "https://base44.app";
+  const serviceToken = "service-token-123";
+  const userToken = "user-token-456";
+  const userId = "user_123";
+  let base44: ReturnType<typeof createClient>;
+  let scope: nock.Scope;
+
+  beforeEach(() => {
+    base44 = createClient({
+      serverUrl,
+      appId,
+      token: userToken,
+      serviceToken,
+    });
+    scope = nock(serverUrl);
+  });
+
+  afterEach(() => {
+    nock.cleanAll();
+  });
+
+  test("getIdToken issues the app-scoped GET request and returns the raw token", async () => {
+    const rawIdToken = "header.payload.signature";
+
+    scope
+      .get(`/api/apps/${appId}/auth/sso/idtoken/${userId}`)
+      .reply(200, JSON.stringify(rawIdToken), {
+        "Content-Type": "application/json",
+      });
+
+    const idToken: string =
+      await base44.asServiceRole.sso.getIdToken(userId);
+
+    expect(idToken).toBe(rawIdToken);
+    expect(scope.isDone()).toBe(true);
+  });
+
+  test("getAccessToken issues the existing GET request and returns the raw token", async () => {
+    const rawAccessToken = "access-token-123";
+
+    scope
+      .get(`/api/apps/${appId}/auth/sso/accesstoken/${userId}`)
+      .reply(200, JSON.stringify(rawAccessToken), {
+        "Content-Type": "application/json",
+      });
+
+    const accessToken =
+      await base44.asServiceRole.sso.getAccessToken(userId);
+
+    // Preserve the legacy public response type for compatibility while
+    // locking down the endpoint's existing raw-string runtime behavior.
+    expect(accessToken).toBe(rawAccessToken);
+    expect(scope.isDone()).toBe(true);
+  });
+
+  test("getIdToken uses the service-role client with on-behalf-of authentication", async () => {
+    const rawIdToken = "raw-id-token";
+
+    scope
+      .get(`/api/apps/${appId}/auth/sso/idtoken/${userId}`)
+      .matchHeader("Authorization", `Bearer ${serviceToken}`)
+      .matchHeader("on-behalf-of", `Bearer ${userToken}`)
+      .reply(200, JSON.stringify(rawIdToken), {
+        "Content-Type": "application/json",
+      });
+
+    const idToken = await base44.asServiceRole.sso.getIdToken(userId);
+
+    expect(idToken).toBe(rawIdToken);
+    expect(scope.isDone()).toBe(true);
+  });
+
+  test("getIdToken surfaces a 404 when no ID token is stored", async () => {
+    scope
+      .get(`/api/apps/${appId}/auth/sso/idtoken/${userId}`)
+      .reply(404, { detail: "No ID token stored", code: "NOT_FOUND" });
+
+    await expect(
+      base44.asServiceRole.sso.getIdToken(userId)
+    ).rejects.toMatchObject({
+      name: "Base44Error",
+      status: 404,
+      code: "NOT_FOUND",
+    });
+
+    expect(scope.isDone()).toBe(true);
+  });
+});