diff --git a/plugins/auth-backend/api-report.md b/plugins/auth-backend/api-report.md
index 41c017ef6b..a4076208ae 100644
--- a/plugins/auth-backend/api-report.md
+++ b/plugins/auth-backend/api-report.md
@@ -124,9 +124,7 @@ export interface BackstageIdentityResponse extends BackstageSignInResult {
   identity: BackstageUserIdentity;
 }
 
-// Warning: (ae-missing-release-tag) "BackstageSignInResult" is exported by the package, but it is missing a release tag (@alpha, @beta, @public, or @internal)
-//
-// @public (undocumented)
+// @public
 export interface BackstageSignInResult {
   // @deprecated
   entity?: Entity;
@@ -299,11 +297,6 @@ export const createSamlProvider: (
   options?: SamlProviderOptions | undefined,
 ) => AuthProviderFactory;
 
-// @public
-export function decorateWithIdentity(
-  signInResolverResponse: Omit<BackstageIdentityResponse, 'identity'>,
-): BackstageIdentityResponse;
-
 // Warning: (ae-missing-release-tag) "factories" is exported by the package, but it is missing a release tag (@alpha, @beta, @public, or @internal)
 //
 // @public (undocumented)
@@ -512,9 +505,7 @@ export type OAuthRefreshRequest = express.Request<{}> & {
   refreshToken: string;
 };
 
-// Warning: (ae-missing-release-tag) "OAuthResponse" is exported by the package, but it is missing a release tag (@alpha, @beta, @public, or @internal)
-//
-// @public (undocumented)
+// @public
 export type OAuthResponse = {
   profile: ProfileInfo;
   providerInfo: OAuthProviderInfo;
@@ -576,6 +567,11 @@ export const postMessageResponse: (
   response: WebMessageResponse,
 ) => void;
 
+// @public
+export function prepareBackstageIdentityResponse(
+  result: BackstageSignInResult,
+): BackstageIdentityResponse;
+
 // @public
 export type ProfileInfo = {
   email?: string;
diff --git a/plugins/auth-backend/src/lib/oauth/OAuthAdapter.ts b/plugins/auth-backend/src/lib/oauth/OAuthAdapter.ts
index bb0bbf9dbd..eb3f7efa42 100644
--- a/plugins/auth-backend/src/lib/oauth/OAuthAdapter.ts
+++ b/plugins/auth-backend/src/lib/oauth/OAuthAdapter.ts
@@ -38,7 +38,7 @@ import {
   OAuthRefreshRequest,
   OAuthState,
 } from './types';
-import { decorateWithIdentity } from '../../providers/decorateWithIdentity';
+import { prepareBackstageIdentityResponse } from '../../providers/prepareBackstageIdentityResponse';
 
 export const THOUSAND_DAYS_MS = 1000 * 24 * 60 * 60 * 1000;
 export const TEN_MINUTES_MS = 600 * 1000;
@@ -240,14 +240,14 @@ export class OAuthAdapter implements AuthProviderRouteHandlers {
     }
 
     if (identity.token) {
-      return decorateWithIdentity(identity);
+      return prepareBackstageIdentityResponse(identity);
     }
 
     const token = await this.options.tokenIssuer.issueToken({
       claims: { sub: identity.id },
     });
 
-    return decorateWithIdentity({ ...identity, token });
+    return prepareBackstageIdentityResponse({ ...identity, token });
   }
 
   private setNonceCookie = (res: express.Response, nonce: string) => {
diff --git a/plugins/auth-backend/src/lib/oauth/types.ts b/plugins/auth-backend/src/lib/oauth/types.ts
index 48e3ffe6ea..cd1439b399 100644
--- a/plugins/auth-backend/src/lib/oauth/types.ts
+++ b/plugins/auth-backend/src/lib/oauth/types.ts
@@ -51,6 +51,11 @@ export type OAuthResult = {
   refreshToken?: string;
 };
 
+/**
+ * The expected response from an OAuth flow.
+ *
+ * @public
+ */
 export type OAuthResponse = {
   profile: ProfileInfo;
   providerInfo: OAuthProviderInfo;
diff --git a/plugins/auth-backend/src/providers/aws-alb/provider.ts b/plugins/auth-backend/src/providers/aws-alb/provider.ts
index 027d5190de..114bc9a204 100644
--- a/plugins/auth-backend/src/providers/aws-alb/provider.ts
+++ b/plugins/auth-backend/src/providers/aws-alb/provider.ts
@@ -32,7 +32,7 @@ import { CatalogIdentityClient } from '../../lib/catalog';
 import { Profile as PassportProfile } from 'passport';
 import { makeProfileInfo } from '../../lib/passport';
 import { AuthenticationError } from '@backstage/errors';
-import { decorateWithIdentity } from '../decorateWithIdentity';
+import { prepareBackstageIdentityResponse } from '../prepareBackstageIdentityResponse';
 
 export const ALB_JWT_HEADER = 'x-amzn-oidc-data';
 export const ALB_ACCESSTOKEN_HEADER = 'x-amzn-oidc-accesstoken';
@@ -199,7 +199,7 @@ export class AwsAlbAuthProvider implements AuthProviderRouteHandlers {
         accessToken: result.accessToken,
         expiresInSeconds: result.expiresInSeconds,
       },
-      backstageIdentity: decorateWithIdentity(backstageIdentity),
+      backstageIdentity: prepareBackstageIdentityResponse(backstageIdentity),
       profile,
     };
   }
diff --git a/plugins/auth-backend/src/providers/index.ts b/plugins/auth-backend/src/providers/index.ts
index 9fe77fe593..4ecbb98fd2 100644
--- a/plugins/auth-backend/src/providers/index.ts
+++ b/plugins/auth-backend/src/providers/index.ts
@@ -47,4 +47,4 @@ export type {
   ProfileInfo,
 } from './types';
 
-export { decorateWithIdentity } from './decorateWithIdentity';
+export { prepareBackstageIdentityResponse } from './prepareBackstageIdentityResponse';
diff --git a/plugins/auth-backend/src/providers/decorateWithIdentity.ts b/plugins/auth-backend/src/providers/prepareBackstageIdentityResponse.ts
similarity index 74%
rename from plugins/auth-backend/src/providers/decorateWithIdentity.ts
rename to plugins/auth-backend/src/providers/prepareBackstageIdentityResponse.ts
index 0e0756f8a8..31df7a4cef 100644
--- a/plugins/auth-backend/src/providers/decorateWithIdentity.ts
+++ b/plugins/auth-backend/src/providers/prepareBackstageIdentityResponse.ts
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { BackstageIdentityResponse } from './types';
+import { BackstageIdentityResponse, BackstageSignInResult } from './types';
 
 function parseJwtPayload(token: string) {
   const [_header, payload, _signature] = token.split('.');
@@ -22,16 +22,20 @@ function parseJwtPayload(token: string) {
 }
 
 /**
- * @public
- *
  * Parses token and decorates the BackstageIdentityResponse with identity information sourced from the token
+ *
+ * @public
  */
-export function decorateWithIdentity(
-  signInResolverResponse: Omit<BackstageIdentityResponse, 'identity'>,
+export function prepareBackstageIdentityResponse(
+  result: BackstageSignInResult,
 ): BackstageIdentityResponse {
-  const { sub, ent } = parseJwtPayload(signInResolverResponse.token);
+  const { sub, ent } = parseJwtPayload(result.token);
   return {
-    ...signInResolverResponse,
+    ...{
+      // TODO: idToken is for backwards compatibility and can be removed in the future
+      idToken: result.token,
+      ...result,
+    },
     identity: {
       type: 'user',
       userEntityRef: sub,
diff --git a/plugins/auth-backend/src/providers/saml/provider.ts b/plugins/auth-backend/src/providers/saml/provider.ts
index d0f7791aaa..8a4afd1fa6 100644
--- a/plugins/auth-backend/src/providers/saml/provider.ts
+++ b/plugins/auth-backend/src/providers/saml/provider.ts
@@ -38,7 +38,7 @@ import { TokenIssuer } from '../../identity/types';
 import { isError } from '@backstage/errors';
 import { CatalogIdentityClient } from '../../lib/catalog';
 import { Logger } from 'winston';
-import { decorateWithIdentity } from '../decorateWithIdentity';
+import { prepareBackstageIdentityResponse } from '../prepareBackstageIdentityResponse';
 
 /** @public */
 export type SamlAuthResult = {
@@ -118,7 +118,8 @@ export class SamlAuthProvider implements AuthProviderRouteHandlers {
           },
         );
 
-        response.backstageIdentity = decorateWithIdentity(signInResponse);
+        response.backstageIdentity =
+          prepareBackstageIdentityResponse(signInResponse);
       }
 
       return postMessageResponse(res, this.appUrl, {
diff --git a/plugins/auth-backend/src/providers/types.ts b/plugins/auth-backend/src/providers/types.ts
index 9f93e6fa21..dafa52163c 100644
--- a/plugins/auth-backend/src/providers/types.ts
+++ b/plugins/auth-backend/src/providers/types.ts
@@ -164,6 +164,14 @@ export type BackstageUserIdentity = {
   ownershipEntityRefs: string[];
 };
 
+/**
+ * A representation of a successful Backstage sign-in.
+ *
+ * Compared to the {@link BackstageIdentityResponse} this type omits
+ * the decoded identity information embedded in the token.
+ *
+ * @public
+ */
 export interface BackstageSignInResult {
   /**
    * An opaque ID that uniquely identifies the user within Backstage.