"OAuth2 not granted or revoked" when trying to evaluate free trial in Chrome extension -

i'm attempting offer free trial period chrome extension , have been following chrome documentation how can accomplished.

when extension loads, though, background script logging following error console:

unchecked runtime.lasterror while running identity.getauthtoken: oauth2 not granted or revoked.

the console pointing @ call chrome.identity.getauthtoken culprit. here's relevant code in background script:

var cws_license_api_url = 'https://www.googleapis.com/chromewebstore/v1.1/userlicenses/';  chrome.identity.getauthtoken({     'interactive': false }, function(token) {     console.log('token', token);      var req = new xmlhttprequest();     req.open('get', cws_license_api_url + chrome.runtime.id);     req.setrequestheader('authorization', 'bearer ' + token);     req.onreadystatechange = function() {         if (req.readystate == 4) {             var license = json.parse(req.responsetext);             console.log('license', license);         }     };     req.send(); }); 

my manifest setup (some pieces omitted brevity):

"manifest_version": 2, "key": "kkkkkkkkkkkkkkk",  "background": {     "scripts": [         "background.js"     ] }, "permissions": [     "storage",     "identity",     "https://www.googleapis.com/" ], "oauth2": {     "client_id": "cccccccccc.apps.googleusercontent.com",     "scopes": [         "https://www.googleapis.com/auth/chromewebstore.readonly"     ] } 

here's i've tried or confirmed:

1. the client id matches value in google developer console generated using extension's id.
2. the chrome web store api enabled in google developer console (it api enabled).
3. the key in manifest matches value generated after put extension on web store.
4. calling getauthtoken interactive mode enabled results in same error.
5. i compared code this example , nothing jumps out @ me being substantially different (although pair of eyes confirm wouldn't hurt).

in case matters, i'm using chrome 42.0.2311.135 (64-bit) on mac os x.

any ideas causing error , need change make go away can lookup auth token , license?

code-wise, change needed enable interactive mode:

chrome.identity.getauthtoken({     'interactive': true }, function(token) {     ... }); 

there couple of pebcak issues going on. namely:

1. it can take few seconds interactive auth page appear. seems bandwidth issue. may part of why documentation suggests triggering auth request on kind of user interaction , not when extension first loads.
2. flipping interactive between false , true , reloading extension not sufficient test of functionality. result of getauthtoken cached. when revoke auth , refresh or delete , re-add extension same token continues returned amount of time. restarting chrome interactive mode enabled got me solution.