diff --git a/types/auth0/auth0-tests.ts b/types/auth0/auth0-tests.ts
index b84e92e223..08a866e9b1 100644
--- a/types/auth0/auth0-tests.ts
+++ b/types/auth0/auth0-tests.ts
@@ -7,7 +7,8 @@ const management = new auth0.ManagementClient({
 
 const auth = new auth0.AuthenticationClient({
   domain: '{YOUR_ACCOUNT}.auth0.com',
-  clientId: '{OPTIONAL_CLIENT_ID}'
+  clientId: '{OPTIONAL_CLIENT_ID}',
+  clientSecret: '{OPTIONAL_CLIENT_SECRET}'
 });
 
 // Using a callback.
diff --git a/types/auth0/index.d.ts b/types/auth0/index.d.ts
index 3025b8d380..07a316268a 100644
--- a/types/auth0/index.d.ts
+++ b/types/auth0/index.d.ts
@@ -1,4 +1,4 @@
-// Type definitions for auth0 3.0
+// Type definitions for auth0 2.3
 // Project: https://github.com/auth0/node-auth0
 // Definitions by: Wilson Hobbs <https://github.com/wbhob>, Seth Westphal <https://github.com/westy92>, Amiram Korach <https://github.com/amiram>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
@@ -83,6 +83,7 @@ export interface Identity {
 
 export interface AuthenticationClientOptions {
   clientId?: string;
+  clientSecret?: string;
   domain: string;
 }
 
@@ -131,6 +132,16 @@ export interface ResetPasswordEmailOptions {
   connection: string;
 }
 
+export interface ClientCredentialsGrantOptions {
+  audience: string;
+}
+
+export interface PasswordGrantOptions {
+  username: string;
+  password: string;
+  realm?: string;
+}
+
 export interface ObjectWithId {
   id: string;
 }
@@ -187,7 +198,8 @@ export interface UnlinkAccountsResponse {
 
 export interface LinkAccountsData {
   user_id: string;
-  connection_id: string;
+  connection_id?: string;
+  provider?: string;
 }
 
 export interface Token {
@@ -254,8 +266,11 @@ export class AuthenticationClient {
   getProfile(accessToken: string): Promise<any>;
   getProfile(accessToken: string, cb: (err: Error, message: string) => void): void;
 
-  getCredentialsGrant(scope: string): Promise<any>;
-  getCredentialsGrant(scope: string, cb: (err: Error, message: string) => void): void;
+  clientCredentialsGrant(options: ClientCredentialsGrantOptions): Promise<any>;
+  clientCredentialsGrant(options: ClientCredentialsGrantOptions, cb: (err: Error, response: any) => void): void;
+
+  passwordGrant(options: PasswordGrantOptions): Promise<any>;
+  passwordGrant(options: PasswordGrantOptions, cb: (err: Error, response: any) => void): void;
 
 }