diff --git a/api/src/app.ts b/api/src/app.ts
index 635534da867..92693fbb095 100644
--- a/api/src/app.ts
+++ b/api/src/app.ts
@@ -30,9 +30,11 @@ import csrf from './plugins/csrf.js';
 import notFound from './plugins/not-found.js';
 import shadowCapture from './plugins/shadow-capture.js';
 import growthBook from './plugins/growth-book.js';
+import serviceBearerAuth from './plugins/service-bearer-auth.js';
 
 import * as publicRoutes from './routes/public/index.js';
 import * as protectedRoutes from './routes/protected/index.js';
+import { classroomRoutes } from './routes/apps/classroom.js';
 
 import {
   API_LOCATION,
@@ -171,6 +173,7 @@ export const build = async (
   void fastify.register(notFound);
   void fastify.register(prismaPlugin);
   void fastify.register(bouncer);
+  await fastify.register(serviceBearerAuth);
 
   // Routes requiring authentication:
   void fastify.register(async function (fastify, _opts) {
@@ -196,7 +199,6 @@ export const build = async (
       fastify.addHook('onRequest', fastify.send401IfNoUser);
 
       await fastify.register(protectedRoutes.userGetRoutes);
-      await fastify.register(protectedRoutes.classroomRoutes);
     });
 
     // Routes that redirect if access is denied:
@@ -232,6 +234,12 @@ export const build = async (
   });
   void fastify.register(examEnvironmentOpenRoutes);
 
+  // Service-to-service app routes (API key auth):
+  void fastify.register(async function (fastify) {
+    fastify.addHook('onRequest', fastify.validateBearerToken);
+    await fastify.register(classroomRoutes, { prefix: '/apps/classroom' });
+  });
+
   if (FCC_ENABLE_SENTRY_ROUTES ?? fastify.gb.isOn('sentry-routes')) {
     void fastify.register(publicRoutes.sentryRoutes);
   }
diff --git a/api/src/plugins/service-bearer-auth.test.ts b/api/src/plugins/service-bearer-auth.test.ts
new file mode 100644
index 00000000000..500fbd1d5c6
--- /dev/null
+++ b/api/src/plugins/service-bearer-auth.test.ts
@@ -0,0 +1,91 @@
+import { describe, test, expect, beforeEach, afterEach, vi } from 'vitest';
+import Fastify, { type FastifyInstance } from 'fastify';
+
+vi.mock('../utils/env', async importOriginal => {
+  const actual = await importOriginal<typeof import('../utils/env.js')>();
+  return {
+    ...actual,
+    TPA_API_BEARER_TOKEN: 'test-api-secret-key'
+  };
+});
+
+import serviceBearerAuth from './service-bearer-auth.js';
+
+describe('service-bearer-auth plugin', () => {
+  let fastify: FastifyInstance;
+
+  beforeEach(async () => {
+    fastify = Fastify();
+    await fastify.register(serviceBearerAuth);
+    fastify.addHook('onRequest', fastify.validateBearerToken);
+    fastify.get('/test', (_req, reply) => {
+      void reply.send({ ok: true });
+    });
+  });
+
+  afterEach(async () => {
+    await fastify.close();
+  });
+
+  test('should allow request with valid bearer token', async () => {
+    const res = await fastify.inject({
+      method: 'GET',
+      url: '/test',
+      headers: {
+        authorization: 'Bearer test-api-secret-key'
+      }
+    });
+
+    expect(res.statusCode).toEqual(200);
+    expect(res.json()).toEqual({ ok: true });
+  });
+
+  test('should return 401 when authorization header is missing', async () => {
+    const res = await fastify.inject({
+      method: 'GET',
+      url: '/test'
+    });
+
+    expect(res.statusCode).toEqual(401);
+    expect(res.json()).toEqual({ error: 'Bearer token is required' });
+  });
+
+  test('should return 401 when authorization header has no Bearer prefix', async () => {
+    const res = await fastify.inject({
+      method: 'GET',
+      url: '/test',
+      headers: {
+        authorization: 'test-api-secret-key'
+      }
+    });
+
+    expect(res.statusCode).toEqual(401);
+    expect(res.json()).toEqual({ error: 'Bearer token is required' });
+  });
+
+  test('should return 401 when bearer token is empty', async () => {
+    const res = await fastify.inject({
+      method: 'GET',
+      url: '/test',
+      headers: {
+        authorization: 'Bearer '
+      }
+    });
+
+    expect(res.statusCode).toEqual(401);
+    expect(res.json()).toEqual({ error: 'Invalid bearer token' });
+  });
+
+  test('should return 401 when bearer token is wrong', async () => {
+    const res = await fastify.inject({
+      method: 'GET',
+      url: '/test',
+      headers: {
+        authorization: 'Bearer wrong-key'
+      }
+    });
+
+    expect(res.statusCode).toEqual(401);
+    expect(res.json()).toEqual({ error: 'Invalid bearer token' });
+  });
+});
diff --git a/api/src/plugins/service-bearer-auth.ts b/api/src/plugins/service-bearer-auth.ts
new file mode 100644
index 00000000000..8398ee7d33f
--- /dev/null
+++ b/api/src/plugins/service-bearer-auth.ts
@@ -0,0 +1,54 @@
+import crypto from 'node:crypto';
+import type {
+  FastifyPluginCallback,
+  FastifyRequest,
+  FastifyReply
+} from 'fastify';
+import fp from 'fastify-plugin';
+
+import { TPA_API_BEARER_TOKEN } from '../utils/env.js';
+
+declare module 'fastify' {
+  interface FastifyInstance {
+    validateBearerToken: (
+      req: FastifyRequest,
+      reply: FastifyReply
+    ) => Promise<void>;
+  }
+}
+
+const plugin: FastifyPluginCallback = (fastify, _options, done) => {
+  fastify.decorate(
+    'validateBearerToken',
+    async function (req: FastifyRequest, reply: FastifyReply) {
+      const secret = TPA_API_BEARER_TOKEN ?? '';
+      if (secret.length === 0) {
+        fastify.log.error('TPA_API_BEARER_TOKEN is not configured');
+        await reply
+          .status(500)
+          .send({ error: 'Service authentication not configured' });
+        return;
+      }
+
+      const authHeader = req.headers.authorization;
+
+      if (!authHeader || !authHeader.startsWith('Bearer ')) {
+        await reply.status(401).send({ error: 'Bearer token is required' });
+        return;
+      }
+
+      const token = authHeader.slice(7);
+      if (
+        token.length !== secret.length ||
+        !crypto.timingSafeEqual(Buffer.from(token), Buffer.from(secret))
+      ) {
+        await reply.status(401).send({ error: 'Invalid bearer token' });
+        return;
+      }
+    }
+  );
+
+  done();
+};
+
+export default fp(plugin, { name: 'service-bearer-auth' });
diff --git a/api/src/routes/apps/classroom.test.ts b/api/src/routes/apps/classroom.test.ts
new file mode 100644
index 00000000000..d1b4cb0d1d6
--- /dev/null
+++ b/api/src/routes/apps/classroom.test.ts
@@ -0,0 +1,293 @@
+import { describe, test, expect, afterEach, vi } from 'vitest';
+
+vi.mock('../../utils/env', async importOriginal => {
+  const actual = await importOriginal<typeof import('../../utils/env.js')>();
+  return {
+    ...actual,
+    TPA_API_BEARER_TOKEN: 'test-classroom-api-secret'
+  };
+});
+
+import request from 'supertest';
+
+import { createUserInput } from '../../utils/create-user.js';
+import {
+  defaultUserEmail,
+  defaultUserId,
+  resetDefaultUser,
+  setupServer
+} from '../../../vitest.utils.js';
+
+const BEARER_TOKEN = 'test-classroom-api-secret';
+
+const classroomUserEmail = 'student1@example.com';
+const nonClassroomUserEmail = 'student2@example.com';
+const classroomUserId = '000000000000000000000001';
+const nonClassroomUserId = '000000000000000000000002';
+
+function post(url: string) {
+  return request(fastifyTestInstance.server)
+    .post(url)
+    .set('authorization', `Bearer ${BEARER_TOKEN}`);
+}
+
+describe('classroom routes', () => {
+  setupServer();
+
+  afterEach(async () => {
+    vi.restoreAllMocks();
+
+    await fastifyTestInstance.prisma.user.deleteMany({
+      where: { email: { in: [classroomUserEmail, nonClassroomUserEmail] } }
+    });
+
+    await resetDefaultUser();
+  });
+
+  describe('Without bearer token', () => {
+    test('POST get-user-id returns 401', async () => {
+      const res = await request(fastifyTestInstance.server)
+        .post('/apps/classroom/get-user-id')
+        .send({ email: 'someone@example.com' });
+
+      expect(res.status).toBe(401);
+      expect(res.body).toStrictEqual({ error: 'Bearer token is required' });
+    });
+
+    test('POST get-user-data returns 401', async () => {
+      const res = await request(fastifyTestInstance.server)
+        .post('/apps/classroom/get-user-data')
+        .send({ userIds: [defaultUserId] });
+
+      expect(res.status).toBe(401);
+      expect(res.body).toStrictEqual({ error: 'Bearer token is required' });
+    });
+  });
+
+  describe('With wrong bearer token', () => {
+    test('POST get-user-id returns 401', async () => {
+      const res = await request(fastifyTestInstance.server)
+        .post('/apps/classroom/get-user-id')
+        .set('authorization', 'Bearer wrong-key')
+        .send({ email: 'someone@example.com' });
+
+      expect(res.status).toBe(401);
+      expect(res.body).toStrictEqual({ error: 'Invalid bearer token' });
+    });
+
+    test('POST get-user-data returns 401', async () => {
+      const res = await request(fastifyTestInstance.server)
+        .post('/apps/classroom/get-user-data')
+        .set('authorization', 'Bearer wrong-key')
+        .send({ userIds: [defaultUserId] });
+
+      expect(res.status).toBe(401);
+      expect(res.body).toStrictEqual({ error: 'Invalid bearer token' });
+    });
+  });
+
+  describe('Authenticated with API key', () => {
+    describe('POST /apps/classroom/get-user-id', () => {
+      test('returns 400 for missing email', async () => {
+        const res = await post('/apps/classroom/get-user-id').send({});
+
+        expect(res.status).toBe(400);
+      });
+
+      test('returns 400 for invalid email format', async () => {
+        const res = await post('/apps/classroom/get-user-id').send({
+          email: 'not-an-email'
+        });
+
+        expect(res.status).toBe(400);
+      });
+
+      test('returns 200 with empty userId when no classroom account matches email', async () => {
+        const res = await post('/apps/classroom/get-user-id').send({
+          email: defaultUserEmail
+        });
+
+        expect(res.status).toBe(200);
+        expect(res.body).toStrictEqual({ userId: '' });
+      });
+
+      test('returns 200 with userId for a classroom account', async () => {
+        await fastifyTestInstance.prisma.user.update({
+          where: { id: defaultUserId },
+          data: { isClassroomAccount: true }
+        });
+
+        const res = await post('/apps/classroom/get-user-id').send({
+          email: defaultUserEmail
+        });
+
+        expect(res.status).toBe(200);
+        expect(res.body).toStrictEqual({ userId: defaultUserId });
+      });
+
+      test('returns 500 when the database query fails', async () => {
+        const original = fastifyTestInstance.prisma.user.findFirst;
+        fastifyTestInstance.prisma.user.findFirst = vi
+          .fn()
+          .mockRejectedValue(new Error('test')) as typeof original;
+
+        const res = await post('/apps/classroom/get-user-id').send({
+          email: defaultUserEmail
+        });
+
+        fastifyTestInstance.prisma.user.findFirst = original;
+
+        expect(res.status).toBe(500);
+        expect(res.body).toStrictEqual({
+          error: 'Failed to retrieve user id'
+        });
+      });
+    });
+
+    describe('POST /apps/classroom/get-user-data', () => {
+      test('returns 400 when more than 50 userIds are provided', async () => {
+        const tooMany = Array.from(
+          { length: 51 },
+          (_, i) => `${String(i).padStart(24, '0')}`
+        );
+
+        const res = await post('/apps/classroom/get-user-data').send({
+          userIds: tooMany
+        });
+
+        expect(res.status).toBe(400);
+      });
+
+      test('returns 200 with empty data for empty userIds array', async () => {
+        const res = await post('/apps/classroom/get-user-data').send({
+          userIds: []
+        });
+
+        expect(res.status).toBe(200);
+        expect(res.body).toStrictEqual({ data: {} });
+      });
+
+      test('returns data only for classroom accounts', async () => {
+        const now = Date.now();
+
+        await fastifyTestInstance.prisma.user.update({
+          where: { id: defaultUserId },
+          data: {
+            isClassroomAccount: true,
+            completedChallenges: [
+              {
+                id: 'challenge-default',
+                completedDate: now,
+                files: []
+              }
+            ]
+          }
+        });
+
+        await fastifyTestInstance.prisma.user.create({
+          data: {
+            ...createUserInput(classroomUserEmail),
+            id: classroomUserId,
+            isClassroomAccount: true,
+            completedChallenges: [
+              {
+                id: 'challenge-student',
+                completedDate: now + 1,
+                files: []
+              }
+            ]
+          }
+        });
+
+        await fastifyTestInstance.prisma.user.create({
+          data: {
+            ...createUserInput(nonClassroomUserEmail),
+            id: nonClassroomUserId,
+            isClassroomAccount: false,
+            completedChallenges: []
+          }
+        });
+
+        const res = await post('/apps/classroom/get-user-data').send({
+          userIds: [defaultUserId, classroomUserId, nonClassroomUserId]
+        });
+
+        expect(res.status).toBe(200);
+        const responseBody = res.body as {
+          data: Record<
+            string,
+            Array<{ id: string; completedDate: number }> | undefined
+          >;
+        };
+        expect(Object.keys(responseBody.data)).toEqual(
+          expect.arrayContaining([defaultUserId, classroomUserId])
+        );
+        expect(responseBody.data).not.toHaveProperty(nonClassroomUserId);
+
+        expect(responseBody.data[defaultUserId]?.[0]).toStrictEqual({
+          id: 'challenge-default',
+          completedDate: now
+        });
+        expect(responseBody.data[classroomUserId]?.[0]).toStrictEqual({
+          id: 'challenge-student',
+          completedDate: now + 1
+        });
+      });
+
+      test('response contains only id and completedDate', async () => {
+        const now = Date.now();
+
+        await fastifyTestInstance.prisma.user.update({
+          where: { id: defaultUserId },
+          data: {
+            isClassroomAccount: true,
+            completedChallenges: [
+              {
+                id: 'challenge-shape-test',
+                completedDate: now,
+                solution: 'http://example.com/solution',
+                files: [
+                  {
+                    contents: 'some code',
+                    ext: 'js',
+                    key: 'indexjs',
+                    name: 'index'
+                  }
+                ]
+              }
+            ]
+          }
+        });
+
+        const res = await post('/apps/classroom/get-user-data').send({
+          userIds: [defaultUserId]
+        });
+
+        expect(res.status).toBe(200);
+        const responseBody = res.body as {
+          data: Record<string, Array<Record<string, unknown>>>;
+        };
+        const challenge = responseBody.data[defaultUserId]![0]!;
+        expect(Object.keys(challenge)).toStrictEqual(['id', 'completedDate']);
+      });
+
+      test('returns 500 when the database query fails', async () => {
+        const original = fastifyTestInstance.prisma.user.findMany;
+        fastifyTestInstance.prisma.user.findMany = vi
+          .fn()
+          .mockRejectedValue(new Error('test')) as typeof original;
+
+        const res = await post('/apps/classroom/get-user-data').send({
+          userIds: [defaultUserId]
+        });
+
+        fastifyTestInstance.prisma.user.findMany = original;
+
+        expect(res.status).toBe(500);
+        expect(res.body).toStrictEqual({
+          error: 'Failed to retrieve user data'
+        });
+      });
+    });
+  });
+});
diff --git a/api/src/routes/apps/classroom.ts b/api/src/routes/apps/classroom.ts
new file mode 100644
index 00000000000..186b0bb60d9
--- /dev/null
+++ b/api/src/routes/apps/classroom.ts
@@ -0,0 +1,88 @@
+import { FastifyPluginCallbackTypebox } from '@fastify/type-provider-typebox';
+import { normalizeDate } from '../../utils/normalize.js';
+import * as schemas from '../../schemas.js';
+
+/**
+ * Routes for the classroom app integration.
+ *
+ * @param fastify The Fastify instance.
+ * @param _options Options passed to the plugin via `fastify.register(plugin, options)`.
+ * @param done The callback to signal that the plugin is ready.
+ */
+export const classroomRoutes: FastifyPluginCallbackTypebox = (
+  fastify,
+  _options,
+  done
+) => {
+  fastify.post(
+    '/get-user-id',
+    {
+      schema: schemas.classroomGetUserIdSchema
+    },
+    async (request, reply) => {
+      const { email } = request.body;
+
+      try {
+        const user = await fastify.prisma.user.findFirst({
+          where: { email, isClassroomAccount: true },
+          select: { id: true }
+        });
+
+        if (!user) {
+          return reply.send({ userId: '' });
+        }
+
+        return reply.send({
+          userId: user.id
+        });
+      } catch (error) {
+        fastify.log.error(error);
+        return reply.code(500).send({ error: 'Failed to retrieve user id' });
+      }
+    }
+  );
+
+  fastify.post(
+    '/get-user-data',
+    {
+      schema: schemas.classroomGetUserDataSchema
+    },
+    async (request, reply) => {
+      const { userIds } = request.body;
+
+      try {
+        const users = await fastify.prisma.user.findMany({
+          where: {
+            id: { in: userIds },
+            isClassroomAccount: true
+          },
+          select: {
+            id: true,
+            completedChallenges: true
+          }
+        });
+
+        const userData: Record<
+          string,
+          { id: string; completedDate: number }[]
+        > = {};
+
+        users.forEach(user => {
+          userData[user.id] = user.completedChallenges.map(challenge => ({
+            id: challenge.id,
+            completedDate: normalizeDate(challenge.completedDate)
+          }));
+        });
+
+        return reply.send({
+          data: userData
+        });
+      } catch (error) {
+        fastify.log.error(error);
+        return reply.code(500).send({ error: 'Failed to retrieve user data' });
+      }
+    }
+  );
+
+  done();
+};
diff --git a/api/src/routes/protected/classroom.test.ts b/api/src/routes/protected/classroom.test.ts
deleted file mode 100644
index f21614c4e16..00000000000
--- a/api/src/routes/protected/classroom.test.ts
+++ /dev/null
@@ -1,217 +0,0 @@
-import { describe, test, expect, beforeAll, afterEach, vi } from 'vitest';
-
-import { createUserInput } from '../../utils/create-user.js';
-import {
-  createSuperRequest,
-  defaultUserEmail,
-  defaultUserId,
-  devLogin,
-  resetDefaultUser,
-  setupServer,
-  superRequest
-} from '../../../vitest.utils.js';
-
-describe('classroom routes', () => {
-  setupServer();
-
-  describe('Authenticated user', () => {
-    let setCookies: string[];
-    let superPost: ReturnType<typeof createSuperRequest>;
-
-    const classroomUserEmail = 'student1@example.com';
-    const nonClassroomUserEmail = 'student2@example.com';
-    const classroomUserId = '000000000000000000000001';
-    const nonClassroomUserId = '000000000000000000000002';
-
-    beforeAll(async () => {
-      setCookies = await devLogin();
-      superPost = createSuperRequest({ method: 'POST', setCookies });
-    });
-
-    afterEach(async () => {
-      vi.restoreAllMocks();
-
-      // Cleanup users created by these tests
-      await fastifyTestInstance.prisma.user.deleteMany({
-        where: { email: { in: [classroomUserEmail, nonClassroomUserEmail] } }
-      });
-
-      // Reset default user to a clean state
-      await resetDefaultUser();
-    });
-
-    describe('POST /api/protected/classroom/get-user-id', () => {
-      test('returns 400 for missing email', async () => {
-        const missingRes = await superPost(
-          '/api/protected/classroom/get-user-id'
-        ).send({});
-
-        expect(missingRes.status).toBe(400);
-      });
-
-      test('returns 200 with empty userId for invalid email format', async () => {
-        const invalidRes = await superPost(
-          '/api/protected/classroom/get-user-id'
-        ).send({ email: 'not-an-email' });
-
-        expect(invalidRes.status).toBe(200);
-        expect(invalidRes.body).toStrictEqual({ userId: '' });
-      });
-
-      test('returns 200 with empty userId when no classroom account matches email', async () => {
-        // Default user is not a classroom account by default
-        const res = await superPost(
-          '/api/protected/classroom/get-user-id'
-        ).send({ email: defaultUserEmail });
-
-        expect(res.status).toBe(200);
-        expect(res.body).toStrictEqual({ userId: '' });
-      });
-
-      test('returns 200 with userId for a classroom account', async () => {
-        // Make the default user a classroom account
-        await fastifyTestInstance.prisma.user.update({
-          where: { id: defaultUserId },
-          data: { isClassroomAccount: true }
-        });
-
-        const res = await superPost(
-          '/api/protected/classroom/get-user-id'
-        ).send({ email: defaultUserEmail });
-
-        expect(res.status).toBe(200);
-        expect(res.body).toStrictEqual({ userId: defaultUserId });
-      });
-
-      test('returns 500 when the database query fails', async () => {
-        vi.spyOn(
-          fastifyTestInstance.prisma.user,
-          'findFirst'
-        ).mockRejectedValue(new Error('test'));
-
-        const res = await superPost(
-          '/api/protected/classroom/get-user-id'
-        ).send({ email: defaultUserEmail });
-
-        expect(res.status).toBe(500);
-        expect(res.body).toStrictEqual({ error: 'Failed to retrieve user id' });
-      });
-    });
-
-    describe('POST /api/protected/classroom/get-user-data', () => {
-      test('returns 400 when more than 50 userIds are provided', async () => {
-        const tooMany = Array.from({ length: 51 }, (_, i) => `id-${i}`);
-
-        const res = await superPost(
-          '/api/protected/classroom/get-user-data'
-        ).send({ userIds: tooMany });
-
-        expect(res.status).toBe(400);
-        expect(res.body).toStrictEqual({
-          error: 'Too many users requested. Maximum 50 allowed.'
-        });
-      });
-
-      test('returns data only for classroom accounts', async () => {
-        const now = Date.now();
-
-        // Make default user a classroom account with one completed challenge
-        await fastifyTestInstance.prisma.user.update({
-          where: { id: defaultUserId },
-          data: {
-            isClassroomAccount: true,
-            completedChallenges: [
-              {
-                id: 'challenge-default',
-                completedDate: now,
-                files: []
-              }
-            ]
-          }
-        });
-
-        // Create an additional classroom user
-        await fastifyTestInstance.prisma.user.create({
-          data: {
-            ...createUserInput(classroomUserEmail),
-            id: classroomUserId,
-            isClassroomAccount: true,
-            completedChallenges: [
-              {
-                id: 'challenge-student',
-                completedDate: now + 1,
-                files: []
-              }
-            ]
-          }
-        });
-
-        // Create a non-classroom user that should be filtered out
-        await fastifyTestInstance.prisma.user.create({
-          data: {
-            ...createUserInput(nonClassroomUserEmail),
-            id: nonClassroomUserId,
-            isClassroomAccount: false,
-            completedChallenges: []
-          }
-        });
-
-        const res = await superPost(
-          '/api/protected/classroom/get-user-data'
-        ).send({
-          userIds: [defaultUserId, classroomUserId, nonClassroomUserId]
-        });
-
-        expect(res.status).toBe(200);
-        const responseBody = res.body as {
-          data: Record<
-            string,
-            Array<{ id: string; completedDate: number }> | undefined
-          >;
-        };
-        expect(Object.keys(responseBody.data)).toEqual(
-          expect.arrayContaining([defaultUserId, classroomUserId])
-        );
-        expect(responseBody.data).not.toHaveProperty(nonClassroomUserId);
-
-        expect(responseBody.data[defaultUserId]?.[0]).toMatchObject({
-          id: 'challenge-default',
-          completedDate: now
-        });
-        expect(responseBody.data[classroomUserId]?.[0]).toMatchObject({
-          id: 'challenge-student',
-          completedDate: now + 1
-        });
-      });
-
-      test('returns 500 when the database query fails', async () => {
-        vi.spyOn(fastifyTestInstance.prisma.user, 'findMany').mockRejectedValue(
-          new Error('test')
-        );
-
-        const res = await superPost(
-          '/api/protected/classroom/get-user-data'
-        ).send({ userIds: [defaultUserId] });
-
-        expect(res.status).toBe(500);
-        expect(res.body).toStrictEqual({
-          error: 'Failed to retrieve user data'
-        });
-      });
-    });
-  });
-
-  describe('Unauthenticated user', () => {
-    test('POST requests are rejected with 401', async () => {
-      const res = await superRequest(
-        '/api/protected/classroom/get-user-id',
-        {
-          method: 'POST'
-        },
-        { sendCSRFToken: false }
-      ).send({ email: 'someone@example.com' });
-
-      expect(res.status).toBe(401);
-    });
-  });
-});
diff --git a/api/src/routes/protected/classroom.ts b/api/src/routes/protected/classroom.ts
deleted file mode 100644
index 921933c7bf0..00000000000
--- a/api/src/routes/protected/classroom.ts
+++ /dev/null
@@ -1,111 +0,0 @@
-import { FastifyPluginCallbackTypebox } from '@fastify/type-provider-typebox';
-import {
-  normalizeChallenges,
-  NormalizedChallenge
-} from '../../utils/normalize.js';
-import * as schemas from '../../schemas/classroom/classroom.js';
-
-/**
- * Fastify plugin for classroom-related protected routes.
- * Provides endpoint for retrieving user data for classrooms.
- * @param fastify - The Fastify instance.
- * @param _options - Plugin options (unused).
- * @param done - Callback to signal plugin registration is complete.
- */
-export const classroomRoutes: FastifyPluginCallbackTypebox = (
-  fastify,
-  _options,
-  done
-) => {
-  // Endpoint to retrieve a user's ID from a user's email.
-  // If we send a 404 error here, it will stop the entire classroom process from working.
-  // Instead, we indicate that the user was not found through a null response and continue.
-  fastify.post(
-    '/api/protected/classroom/get-user-id',
-    {
-      schema: schemas.classroomGetUserIdSchema
-    },
-    async (request, reply) => {
-      const { email } = request.body;
-
-      // Basic email validation - return empty userId for invalid emails
-      const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
-      if (!emailRegex.test(email)) {
-        return reply.send({ userId: '' });
-      }
-
-      try {
-        // Find the user by email
-        const user = await fastify.prisma.user.findFirst({
-          where: { email, isClassroomAccount: true },
-          select: { id: true }
-        });
-
-        if (!user) {
-          return reply.send({ userId: '' });
-        }
-
-        return reply.send({
-          userId: user.id
-        });
-      } catch (error) {
-        fastify.log.error(error);
-        return reply.code(500).send({ error: 'Failed to retrieve user id' });
-      }
-    }
-  );
-
-  // Endpoint to retrieve user(s) data from a list of user ids
-  fastify.post(
-    '/api/protected/classroom/get-user-data',
-    {
-      schema: schemas.classroomGetUserDataSchema
-    },
-    async (request, reply) => {
-      const { userIds = [] } = request.body;
-
-      // Limit number of users per request for performance
-      // Send custom error message if this is exceeded
-      if (userIds.length > 50) {
-        return reply.code(400).send({
-          error: 'Too many users requested. Maximum 50 allowed.'
-        });
-      }
-
-      try {
-        // Find all the requested users by user id
-        const users = await fastify.prisma.user.findMany({
-          where: {
-            id: { in: userIds },
-            isClassroomAccount: true
-          },
-          select: {
-            id: true,
-            completedChallenges: true
-          }
-        });
-
-        // Map to transform user data into the required format
-        const userData: Record<string, NormalizedChallenge[]> = {};
-
-        users.forEach(user => {
-          // Normalize challenges
-          const normalizedChallenges = normalizeChallenges(
-            user.completedChallenges
-          );
-
-          userData[user.id] = normalizedChallenges;
-        });
-
-        return reply.send({
-          data: userData
-        });
-      } catch (error) {
-        fastify.log.error(error);
-        return reply.code(500).send({ error: 'Failed to retrieve user data' });
-      }
-    }
-  );
-
-  done();
-};
diff --git a/api/src/routes/protected/index.ts b/api/src/routes/protected/index.ts
index 87e738f8035..01c1fb9208e 100644
--- a/api/src/routes/protected/index.ts
+++ b/api/src/routes/protected/index.ts
@@ -1,6 +1,5 @@
 export * from './certificate.js';
 export * from './challenge.js';
-export * from './classroom.js';
 export * from './donate.js';
 export * from './settings.js';
 export * from './user.js';
diff --git a/api/src/schemas.ts b/api/src/schemas.ts
index 88335b2a29e..d21a35c06d1 100644
--- a/api/src/schemas.ts
+++ b/api/src/schemas.ts
@@ -51,3 +51,7 @@ export {
 } from './schemas/user/exam-environment-token.js';
 export { sentryPostEvent } from './schemas/sentry/event.js';
 export { signout } from './schemas/signout/signout.js';
+export {
+  classroomGetUserIdSchema,
+  classroomGetUserDataSchema
+} from './schemas/classroom/classroom.js';
diff --git a/api/src/schemas/classroom/classroom.ts b/api/src/schemas/classroom/classroom.ts
index bd56308c45e..3484531f28c 100644
--- a/api/src/schemas/classroom/classroom.ts
+++ b/api/src/schemas/classroom/classroom.ts
@@ -1,30 +1,37 @@
 import { Type } from '@fastify/type-provider-typebox';
 export const classroomGetUserIdSchema = {
   body: Type.Object({
-    email: Type.String({ maxLength: 1024 })
+    email: Type.String({ format: 'email', maxLength: 1024 })
   }),
   response: {
     200: Type.Object({ userId: Type.String() }),
+    400: Type.Object({ error: Type.String() }),
+    401: Type.Object({ error: Type.String() }),
     500: Type.Object({ error: Type.String() })
   }
 };
 export const classroomGetUserDataSchema = {
   body: Type.Object({
-    userIds: Type.Array(Type.String())
+    userIds: Type.Array(
+      Type.String({ format: 'objectid', maxLength: 24, minLength: 24 }),
+      { maxItems: 50 }
+    )
   }),
   response: {
     200: Type.Object({
       data: Type.Record(
-        Type.String(),
+        Type.String({ maxLength: 24 }),
         Type.Array(
           Type.Object({
             id: Type.String(),
             completedDate: Type.Number()
           })
-        )
+        ),
+        { propertyNames: { maxLength: 24 } }
       )
     }),
     400: Type.Object({ error: Type.String() }),
+    401: Type.Object({ error: Type.String() }),
     500: Type.Object({ error: Type.String() })
   }
 };
diff --git a/api/src/utils/env.ts b/api/src/utils/env.ts
index f38d3e3389a..2a1dfd59a05 100644
--- a/api/src/utils/env.ts
+++ b/api/src/utils/env.ts
@@ -158,6 +158,15 @@ if (process.env.FREECODECAMP_NODE_ENV !== 'development') {
     'fastify_api_sdk_client_key_from_growthbook_dashboard',
     'The GROWTHBOOK_FASTIFY_CLIENT_KEY env should be changed from the default value.'
   );
+  assert.ok(
+    process.env.TPA_API_BEARER_TOKEN,
+    'TPA_API_BEARER_TOKEN should be set.'
+  );
+  assert.notEqual(
+    process.env.TPA_API_BEARER_TOKEN,
+    'tpa_api_bearer_token_from_dashboard',
+    'The TPA_API_BEARER_TOKEN env should be changed from the default value.'
+  );
 }
 
 export const HOME_LOCATION = process.env.HOME_LOCATION;
@@ -217,6 +226,7 @@ export const GROWTHBOOK_FASTIFY_API_HOST =
   process.env.GROWTHBOOK_FASTIFY_API_HOST;
 export const GROWTHBOOK_FASTIFY_CLIENT_KEY =
   process.env.GROWTHBOOK_FASTIFY_CLIENT_KEY;
+export const TPA_API_BEARER_TOKEN = process.env.TPA_API_BEARER_TOKEN;
 
 function undefinedOrBool(val: string | undefined): undefined | boolean {
   if (!val) {
diff --git a/api/turbo.json b/api/turbo.json
index 8d502f53d00..2f830fbcb8a 100644
--- a/api/turbo.json
+++ b/api/turbo.json
@@ -35,7 +35,8 @@
         "SES_REGION",
         "SES_SECRET",
         "SHOW_UPCOMING_CHANGES",
-        "STRIPE_SECRET_KEY"
+        "STRIPE_SECRET_KEY",
+        "TPA_API_BEARER_TOKEN"
       ]
     },
     "test": {
@@ -72,7 +73,8 @@
         "SES_REGION",
         "SES_SECRET",
         "SHOW_UPCOMING_CHANGES",
-        "STRIPE_SECRET_KEY"
+        "STRIPE_SECRET_KEY",
+        "TPA_API_BEARER_TOKEN"
       ]
     }
   }
diff --git a/sample.env b/sample.env
index cf7da4a55d9..7282de139ef 100644
--- a/sample.env
+++ b/sample.env
@@ -24,6 +24,9 @@ ALGOLIA_API_KEY=api_key_from_algolia_dashboard
 STRIPE_PUBLIC_KEY=pk_from_stripe_dashboard
 STRIPE_SECRET_KEY=sk_from_stripe_dashboard
 
+# Third-party App API
+TPA_API_BEARER_TOKEN=tpa_api_bearer_token_from_dashboard
+
 # PayPal
 PAYPAL_CLIENT_ID=id_from_paypal_dashboard