diff --git a/api/client/users.ts b/api/client/users.ts
new file mode 100644
index 000000000..a794d5306
--- /dev/null
+++ b/api/client/users.ts
@@ -0,0 +1,35 @@
+//
+// Copyright (c) Microsoft.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+import { NextFunction, Response, Router } from 'express';
+import asyncHandler from 'express-async-handler';
+
+import { ReposAppRequest, AccountJsonFormat } from '../../interfaces';
+import { CreateError, getProviders } from '../../transitional';
+
+const router: Router = Router();
+
+router.get(
+  '/:login',
+  asyncHandler(async (req: ReposAppRequest, res: Response, next: NextFunction) => {
+    const { operations } = getProviders(req);
+    const login = req.params.login as string;
+    try {
+      if (!login) {
+        throw CreateError.ParameterRequired('login');
+      }
+      const accountInfo = await operations.getAccountByUsername(login);
+      return res.json(accountInfo.asJson(AccountJsonFormat.GitHubExtended)) as any as void;
+    } catch (error) {
+      return next(error);
+    }
+  })
+);
+
+router.use('*', (req, res: Response, next: NextFunction) => {
+  return next(CreateError.NotFound('/users: no API found'));
+});
+
+export default router;
diff --git a/business/repositoryInvitation.ts b/business/repositoryInvitation.ts
new file mode 100644
index 000000000..449774cbb
--- /dev/null
+++ b/business/repositoryInvitation.ts
@@ -0,0 +1,77 @@
+//
+// Copyright (c) Microsoft.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+import { GitHubRepositoryPermission, GitHubSimpleAccount } from '../interfaces';
+import * as common from './common';
+import { Repository } from './repository';
+
+const primaryProperties = ['inviter', 'invitee', 'permissions', 'created_at', 'html_url', 'node_id'];
+
+export type RepositoryInvitationClientJson = {
+  inviter: {
+    id: number;
+    login: string;
+  };
+  invitee: {
+    id: number;
+    login: string;
+  };
+  permissions: GitHubRepositoryPermission;
+  created_at: string;
+  html_url: string;
+  // node_id: string;
+};
+
+export class RepositoryInvitation {
+  public static PrimaryProperties = primaryProperties;
+
+  private _inviter: GitHubSimpleAccount;
+  private _invitee: GitHubSimpleAccount;
+  private _permissions: GitHubRepositoryPermission;
+  private _html_url: string;
+  private _created_at: string;
+
+  constructor(
+    private repository: Repository,
+    entity: unknown
+  ) {
+    if (entity) {
+      common.assignKnownFieldsPrefixed(this, entity, 'invitation', primaryProperties);
+    }
+  }
+
+  asJson(): RepositoryInvitationClientJson {
+    return {
+      invitee: this.invitee,
+      inviter: this.inviter,
+      permissions: this.permission,
+      html_url: this.invitationUrl,
+      created_at: this._created_at,
+    };
+  }
+
+  get permission(): GitHubRepositoryPermission {
+    return this._permissions;
+  }
+
+  // getHighestPermission() {
+  //   if (!this._permissions) {
+  //     return GitHubRepositoryPermission.None;
+  //   }
+  //   return projectCollaboratorPermissionsObjectToGitHubRepositoryPermission(this._permissions);
+  // }
+
+  get inviter(): GitHubSimpleAccount {
+    return this._inviter;
+  }
+
+  get invitee(): GitHubSimpleAccount {
+    return this._invitee;
+  }
+
+  get invitationUrl(): string {
+    return this._html_url;
+  }
+}