I’m using the PHP SDK to generate social login URLs, like this:
$auth0->login( 'https://example.com/callback.php', array( 'connection' => 'facebook' ) );
This works fine for providers like
google-oauth2 but for Facebook, I receive an error in my callback function after logging in via the Facebook login form.
The callback URL looks like this:
callback.php?error=invalid_request&error_description=Error validating client secret.&state=#_=_
There is an Exception thrown:
Auth0\SDK\Exception\StateException Error: Missing code
My client secret is configured correctly as per the quickstart guide and as I said this works fine with Google.
I did have this working previously - I don’t believe I’ve made any code changes, so I don’t know why this has suddenly stopped working.
Edit: One thing I did do was I switched from using the OAuth dev keys to using a real Facebook API key, but then I switched it back (left the fields blank in the Auth0 settings page) to continue development. Not sure if this could be a contributing factor?
Any ideas please?