I've get next response (even with oauth_token for admin user)
You don't have permission to access /metadata/ on this server.
Could you provide more details of the REST call that your are doing and which protocol you use?
If you send a GET request like the following you should receive an answer also with a trial account:
Could it be the additional slash after /metadata/ - maybe try /metadata to see if that works.
I've use https.
oauth_token I get for "admin" accountSlash after metadata word added automatically in browser.If I try to send GET request in sprcial tools, in one I get response We are sorry, but Chrome API does not allow to get a response body for redirect.
And in another:
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<p>You don't have permission to access /metadata/
on this server.</p>
Retrieving data ...