refresh_token.diff

diff --git a/examples/oauth.ts b/examples/refresh_token.ts
index d55e62d..0abcb8a 100644
--- a/examples/oauth.ts
+++ b/examples/refresh_token.ts
@@ -41,7 +41,7 @@ let state: string | undefined
   authorizationUrl.searchParams.set('client_id', client.client_id)
   authorizationUrl.searchParams.set('redirect_uri', redirect_uri)
   authorizationUrl.searchParams.set('response_type', 'code')
-  authorizationUrl.searchParams.set('scope', 'api:read')
+  authorizationUrl.searchParams.set('scope', 'api:read offline_access')
   authorizationUrl.searchParams.set('code_challenge', code_challenge)
   authorizationUrl.searchParams.set('code_challenge_method', code_challenge_method)
 
@@ -60,6 +60,7 @@ let state: string | undefined
 // one eternity later, the user lands back on the redirect_uri
 // Authorization Code Grant Request & Response
 let access_token: string
+let refresh_token: string | undefined
 {
   const currentUrl: URL = getCurrentUrl()
   const params = oauth.validateAuthResponse(as, client, currentUrl, state)
@@ -76,7 +77,7 @@ let access_token: string
   const result = await oauth.processAuthorizationCodeResponse(as, client, response)
 
   console.log('Access Token Response', result)
-  ;({ access_token } = result)
+  ;({ access_token, refresh_token } = result)
 }
 
 // Protected Resource Request
@@ -89,3 +90,13 @@ let access_token: string
 
   console.log('Protected Resource Response', await response.json())
 }
+
+// Refresh Token Grant Request & Response
+if (refresh_token) {
+  const response = await oauth.refreshTokenGrantRequest(as, client, clientAuth, refresh_token)
+
+  const result = await oauth.processRefreshTokenResponse(as, client, response)
+
+  console.log('Access Token Response', result)
+  ;({ access_token, refresh_token } = result)
+}