The meetup example is added

Author: oshliaer

samples/Meetup.gs

@@ -0,0 +1,72 @@
+/**
+ * Extend your community - Meetup. Meetup API
+ * http://www.meetup.com/meetup_api/
+ * http://www.meetup.com/meetup_api/auth/#oauth2
+ */
+
+var CLIENT_ID = '...';
+var CLIENT_SECRET = '...';
+
+/**
+ * Authorizes and makes a request to the Meetup API.
+ */
+
+function run() {
+  var service = getService();
+  if (service.hasAccess()) {
+    var url = 'https://api.meetup.com/dashboard';
+    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() {
+  var service = getService();
+  service.reset();
+}
+
+/**
+ * Configures the service.
+ */
+function getService() {
+  return OAuth2.createService('Meetup')
+    // Set the endpoint URLs.
+    .setAuthorizationBaseUrl('https://secure.meetup.com/oauth2/authorize')
+    .setTokenUrl('https://secure.meetup.com/oauth2/access')
+
+  // 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());
+}
+
+/**
+ * Handles the OAuth callback.
+ */
+function authCallback(request) {
+  var service = getService();
+  var authorized = service.handleCallback(request);
+  if (authorized) {
+    return HtmlService.createHtmlOutput('Success!');
+  } else {
+    return HtmlService.createHtmlOutput('Denied');
+  }
+}