Handled configurable scope in token issuer

            'aud' => $audience

        );

        $conf = $this->getTokenIssuerConfig($audience);

        if (property_exists($conf, 'aud')) {

            $payload['aud'] = $conf->aud;

        }

        if (property_exists($conf, 'scope')) {

            $payload['scope'] = $conf->scope;

        }

        return JWT::encode($payload, $keyPair->privateKey, $keyPair->alg, $keyPair->keyId);

    }

    private function getTokenIssuerConfig($audience) {

        foreach ($this->locator->config->tokenIssuer->services as $service) {

            if ($service->id === $audience) {

                return $service;

            }

        }

        throw new \Exception("Unable to find configuration for " . $audience);

    }

}