private_key_jwt.diff

diff --git a/examples/oauth.ts b/examples/private_key_jwt.ts
index d55e62d..8bf4f3a 100644
--- a/examples/oauth.ts
+++ b/examples/private_key_jwt.ts
@@ -9,12 +9,16 @@ let algorithm!:
   | 'oidc' /* For .well-known/openid-configuration discovery */
   | undefined /* Defaults to 'oidc' */
 let client_id!: string
-let client_secret!: string
 /**
  * Value used in the authorization request as redirect_uri pre-registered at the Authorization
  * Server.
  */
 let redirect_uri!: string
+/**
+ * A key that the client has pre-registered at the Authorization Server for use with Private Key JWT
+ * client authentication method.
+ */
+let clientPrivateKey!: oauth.CryptoKey
 
 // End of prerequisites
 
@@ -23,7 +27,7 @@ const as = await oauth
   .then((response) => oauth.processDiscoveryResponse(issuer, response))
 
 const client: oauth.Client = { client_id }
-const clientAuth = oauth.ClientSecretPost(client_secret)
+const clientAuth = oauth.PrivateKeyJwt(clientPrivateKey)
 
 const code_challenge_method = 'S256'
 /**