...
- client_id (mandatory): this is your vendor ID, returned to you by the /wiki/spaces/OL/pages/1671181 getDeveloperAppKeys call provided you have been registered as a web vendor
- response_type: this needs to be set to 'code', to indicate you are requesting an authorization code (see later)
- redirect_uri (optional): this will be appended to the URL you provided upon sign up to the Vendor Program when we redirect the user back to your site after login. This needs to be URL encoded.
...