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+/*
+ * This sample demonstrates how to configure the library for the Mailchimp API.
+ * Instructions on how to generate OAuth credentuals is available here:
+ * https://mailchimp.com/developer/guides/how-to-use-oauth2/#Step_1%3A_Register_your_application
+ */
+
+var CLIENT_ID = '...';
+var CLIENT_SECRET = '...';
+
+/**
+ * Authorizes and makes a request to the Docusign API.
+ */
+function run() {
+  var service = getService();
+  if (service.hasAccess()) {
+    // Retrieve the account ID and base URI from storage.
+    var storage = service.getStorage();
+    var dc = storage.getValue('dc');
+
+    // Make a request to retrieve the Mailchimp campaigns.
+    var url = 'https://' + dc + '.api.mailchimp.com/3.0/campaigns/';
+    var response = UrlFetchApp.fetch(url, {
+      headers: {
+        Authorization: 'Bearer ' + service.getAccessToken()
+      }
+    });
+    var result = JSON.parse(response.getContentText());
+    Logger.log(JSON.stringify(result, null, 2));
+  } else {
+    var authorizationUrl = service.getAuthorizationUrl();
+    Logger.log('Open the following URL and re-run the script: %s',
+        authorizationUrl);
+  }
+}
+
+/**
+ * Reset the authorization state, so that it can be re-tested.
+ */
+function reset() {
+  getService().reset();
+}
+
+/**
+ * Configures the service.
+ */
+function getService() {
+  return OAuth2.createService('Mailchimp')
+    // Set the endpoint URLs.
+    .setAuthorizationBaseUrl('https://login.mailchimp.com/oauth2/authorize')
+    .setTokenUrl('https://login.mailchimp.com/oauth2/token')
+
+    // Set the client ID and secret.
+    .setClientId(CLIENT_ID)
+    .setClientSecret(CLIENT_SECRET)
+
+    // Set the name of the callback function that should be invoked to
+    // complete the OAuth flow.
+    .setCallbackFunction('authCallback')
+
+    // Set the property store where authorized tokens should be persisted.
+    .setPropertyStore(PropertiesService.getUserProperties())
+
+    // Set the cache store where authorized tokens should be persisted.
+    .setCache(CacheService.getUserCache());
+};
+
+/**
+ * Handles the OAuth callback.
+ */
+function authCallback(request) {
+  var service = getService();
+  var authorized = service.handleCallback(request);
+  if (authorized) {
+    // Get the user info to determine the data center needed for
+    // future requests.
+    var url = 'https://login.mailchimp.com/oauth2/metadata';
+    var response = UrlFetchApp.fetch(url, {
+      headers: {
+        Authorization: 'Bearer ' + service.getAccessToken()
+      }
+    });
+    var result = JSON.parse(response.getContentText());
+
+    // Store the Mailchimp datacenter for future API calls.
+    var storage = service.getStorage();
+    storage.setValue('dc', result.dc);
+
+    return HtmlService.createHtmlOutput('Success!');
+  } else {
+    return HtmlService.createHtmlOutput('Denied.');
+  }
+}
+
+/**
+ * Logs the redict URI to register in the Mailchimp application settings.
+ */
+function logRedirectUri() {
+  Logger.log(OAuth2.getRedirectUri());
+}