ScopeEntity is JsonSerializable

src/Entities/Interfaces/ScopeEntityInterface.php

@@ -1,7 +1,7 @@
 <?php
 namespace League\OAuth2\Server\Entities\Interfaces;
 
-interface ScopeEntityInterface
+interface ScopeEntityInterface extends \JsonSerializable
 {
     /**
      * Get the scope's identifier

src/Entities/ScopeEntity.php

@@ -11,4 +11,12 @@ use League\OAuth2\Server\Entities\Traits\EntityTrait;
 class ScopeEntity implements ScopeEntityInterface
 {
     use EntityTrait;
+
+    /**
+     * @inheritdoc
+     */
+    function jsonSerialize()
+    {
+        return $this->getIdentifier();
+    }
 }