When you make requests to the Eventbrite API using oauth2 access_token you need to send an Authorization header field with value of Bearer otherwise you get error.

This is not needed for all the oauth stuff just the last call to the API to fetchUserDetails.

I am not sure if this will brake other requests to other providers or if they will just ignore this extra header?

src/League/OAuth2/Client/Provider/IdentityProvider.php

@@ -171,6 +171,7 @@ abstract class IdentityProvider
             try {
 
                 $client = new GuzzleClient($url);
+                $client->setDefaultOption('headers', array('Authorization' => 'Bearer'));
                 $request = $client->get()->send();
                 $response = $request->getBody();
                 $this->cachedUserDetailsResponse = $response;