Error: redirect_uri_mismatch

When i try to create an access token Google is failing with:

The redirect URI in the request: http://www.###.co.uk/wp-admin/edit.php?post_type=product&page=product_wogo did not match a registered redirect URI.

Notice how it has the & character, and not just the & character.
E.G : http://www.###.co.uk/wp-admin/edit.php?post_type=product&page=product_wogo

I have tried editing the Redirect URIs in the Credentials to use the &
but that did not seem to work.

How do i create the token if the URI is failing, what should i do ?

Thank you for any help.