validate oauth token endpoint get instead of post

[CodeWizardTV]

In OAuthTrait.php validateOAuthToken needs to be changed to get instead of post, otherwise it returns a 404

public function validateOAuthToken(): Result
    {
        return $this->get(self::OAUTH_BASE_URI . 'validate');
    }

[romanzipp]

Thanks for the report! Fixed in 4.6.1