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var oAuthConfig = UrlFetchApp.addOAuthService("analytics");
oAuthConfig.setAccessTokenUrl("https://www.google.com/accounts/OAuthGetAccessToken");
oAuthConfig.setRequestTokenUrl("https://www.google.com/accounts/OAuthGetRequestToken?scope=https%3A%2F%2Fwww.google.com%2Fanalytics%2Ffeeds%2F");
oAuthConfig.setAuthorizationUrl("https://www.google.com/accounts/OAuthAuthorizeToken");
oAuthConfig.setConsumerKey("anonymous");
oAuthConfig.setConsumerSecret("anonymous");
var options = {"oAuthServiceName": "analytics",
               "oAuthUseToken": "always"};

var url = "https://www.google.com/analytics/feeds/accounts/default"; // put here whatever you want from analytics data api
var response = UrlFetchApp.fetch(url, options);