diff --git a/packages/core/src/api/apis/implementations/auth/google/GoogleAuth.ts b/packages/core/src/api/apis/implementations/auth/google/GoogleAuth.ts
index d74b159095..f0147c1805 100644
--- a/packages/core/src/api/apis/implementations/auth/google/GoogleAuth.ts
+++ b/packages/core/src/api/apis/implementations/auth/google/GoogleAuth.ts
@@ -16,10 +16,15 @@
 
 import { AuthHelper } from './GoogleAuthHelper';
 import GoogleScopes from './GoogleScopes';
-import { GoogleAuthApi, GoogleSession, IdTokenOptions } from './types';
+import { GoogleSession } from './types';
 import { OAuthScopes } from '../../..';
+import {
+  OAuthApi,
+  OpenIdConnectApi,
+  IdTokenOptions,
+} from '../../../definitions/auth';
 
-class GoogleAuth implements GoogleAuthApi {
+class GoogleAuth implements OAuthApi, OpenIdConnectApi {
   private currentSession: GoogleSession | undefined;
 
   constructor(private readonly helper: AuthHelper) {}
diff --git a/packages/core/src/api/apis/implementations/auth/google/types.ts b/packages/core/src/api/apis/implementations/auth/google/types.ts
index a41c306aa1..55d9a7ecf2 100644
--- a/packages/core/src/api/apis/implementations/auth/google/types.ts
+++ b/packages/core/src/api/apis/implementations/auth/google/types.ts
@@ -16,79 +16,9 @@
 
 import GoogleScopes from './GoogleScopes';
 
-/**
- * This api provides access to Google OAuth credentials. It lets you request access tokens,
- * which can be used to act on behalf of the user when talking to Google APIs. It also supplies
- * ID Tokens, which can be passed to backend services to prove the user's identity.
- *
- * The API can be called directly to get access and ID tokens, which will cause a modal dialog
- * to show up if the user is not yet signed in.
- *
- * For more fine grained control of where the sign in prompt is shown, it is possible to use
- * the GoogleAuthBarrier components, which ensures that all components rendered inside it
- * have synchronous access to both access and ID tokens.
- *
- * For full examples, see https://backstage.spotify.net/docs/backstage-frontend/apis/#google-auth-api
- */
-export type GoogleAuthApi = {
-  /**
-   * Requests a Google OAuth ID Token, optionally with a set of scopes. The scopes allow you to access
-   * google APIs on behalf of the user. A full list of scopes can be found at https://developers.google.com/identity/protocols/googlescopes.
-   *
-   * Be sure to include all required scopes when requesting an access token. When testing your implementation
-   * it is best to log out the Backstage Google session and then visit your plugin page directly, as
-   * you might already have some required scopes in your existing session. Not requesting the correct
-   * scopes can lead to 403 or other authorization errors, which can be tricky to debug.
-   *
-   * This method is cheap and should be called each time an access token is used. Do not for example
-   * store the access token in React component state, as that could cause the token to expire. Instead
-   * fetch a new access token for each request.
-   *
-   * If the user has not yet logged in to Google inside Backstage, a dialog window will be shown
-   * that prompts the user to log in, and the returned promise will not resolve until the user has
-   * successfully logged in.
-   *
-   * The returned promise can be rejected, but only if the user rejects the login request. If the
-   * login fails because the user fails to log in to their google account, the dialog will simply
-   * remain and ask them to try again, and the promise will still be pending.
-   */
-  getAccessToken(scope?: string | string[]): Promise<string>;
-
-  /**
-   * Requests a Google OAuth ID Token.
-   *
-   * Note that the ID token payload is only guaranteed to contain the user's numerical Google ID,
-   * email and expiration information. Do not rely on any other fields, as they might not be present.
-   *
-   * This method is cheap and should be called each time an ID token is used. Do not for example
-   * store the id token in React component state, as that could cause the token to expire. Instead
-   * fetch a new id token for each request.
-   *
-   * If the user has not yet logged in to Google inside Backstage, a dialog window will be shown
-   * that prompts the user to log in, and the returned promise will not resolve until the user has
-   * successfully logged in.
-   *
-   * The returned promise can be rejected, but only if the user rejects the login request. If the
-   * login fails because the user fails to log in to their google account, the dialog will simply
-   * remain and ask them to try again, and the promise will still be pending.
-   */
-  getIdToken(options?: IdTokenOptions): Promise<string>;
-
-  /**
-   * Logs out the user's Google session. This will reload the page.
-   */
-  logout(): Promise<void>;
-};
-
 export type GoogleSession = {
   idToken: string;
   accessToken: string;
   scopes: GoogleScopes;
   expiresAt: Date;
 };
-
-export type IdTokenOptions = {
-  // If this is set to true, the user will not be prompted to log in,
-  // and an empty id token will be returned if there is no existing session.
-  optional?: boolean;
-};