diff --git a/README.md b/README.md
index 614bda9..df02f29 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ This helper takes care of all the headaches and boilerplate code with a simple a
   - Expires option
   - Credential token key
   - Access token key
-- Improve data validation and error messages
+~~- Improve data validation and error messages~~
 - Write/update readme
 - Make the cache store configurable
 - Maybe: add more tests
diff --git a/src/Credentials.php b/src/Credentials.php
index 8426ec0..b14d143 100644
--- a/src/Credentials.php
+++ b/src/Credentials.php
@@ -158,9 +158,11 @@ public function addAuthToBody(array $requestBody, Options $options): array
     public function setRefreshToken(string $token): void
     {
         $this->token = $token;
+        /*
         if (empty($this->options->authType)) {
-            //$this->options->authType = self::AUTH_TYPE_BEARER;
+            $this->options->authType = self::AUTH_TYPE_BEARER;
         }
+        */
     }
 
     public function setClientCredentialsPair(string $clientId, string $clientSecret): void
diff --git a/src/Options.php b/src/Options.php
index d87d976..66a90e8 100644
--- a/src/Options.php
+++ b/src/Options.php
@@ -41,7 +41,9 @@ public function toArray(): array
 
     protected function validateOptions(): void
     {
+        // Note: closures can't be checked at this point since we don't have access to the response objects
         Validator::make((array) $this, [
+            'scopes.*' => 'string',
             'authType' => Rule::in([
                 Credentials::AUTH_TYPE_BEARER,
                 Credentials::AUTH_TYPE_BODY,
@@ -58,6 +60,7 @@ protected function validateOptions(): void
                 AccessToken::TYPE_QUERY,
                 AccessToken::TYPE_CUSTOM,
             ]),
+            'tokenName' => 'string',
         ])->validate();
     }
 
diff --git a/tests/Unit/OptionsTest.php b/tests/Unit/OptionsTest.php
index e2ea065..52273d4 100644
--- a/tests/Unit/OptionsTest.php
+++ b/tests/Unit/OptionsTest.php
@@ -11,7 +11,7 @@
     $this->expectException(\Illuminate\Validation\ValidationException::class);
     $this->expectExceptionMessage('The selected grant type is invalid');
 
-    $options = new Options(
+    new Options(
         grantType: 'invalid',
         tokenType: AccessToken::TYPE_BEARER,
     );
@@ -21,7 +21,7 @@
     $this->expectException(\Illuminate\Validation\ValidationException::class);
     $this->expectExceptionMessage('The selected token type is invalid');
 
-    $options = new Options(
+    new Options(
         grantType: Credentials::GRANT_TYPE_CLIENT_CREDENTIALS,
         tokenType: 'invalid',
     );
@@ -31,19 +31,35 @@
     $this->expectException(ValidationException::class);
     $this->expectExceptionMessage('The selected auth type is invalid');
 
-    $options = new Options(
+    new Options(
         authType: 'invalid',
     );
 });
 
+it('checks for integers in scopes when creating an option object', function () {
+    $this->expectException(ValidationException::class);
+    $this->expectExceptionMessage('The scopes.1 field must be a string.');
+
+    new Options(
+        scopes: ['valid', 1],
+    );
+});
+it('checks for objects in scopes when creating an option object', function () {
+
+    $this->expectException(ValidationException::class);
+    $this->expectExceptionMessage('The scopes.2 field must be a string.');
+
+    new Options(
+        scopes: ['valid', 'also_valid', new stdClass()],
+    );
+});
+
 it('can create an option object', function () {
     $this->expectException(\Illuminate\Validation\ValidationException::class);
     $this->expectExceptionMessage('The selected token type is invalid');
 
-    $options = new Options(
+    new Options(
         grantType: Credentials::GRANT_TYPE_CLIENT_CREDENTIALS,
         tokenType: 'invalid',
     );
-
-    //dd($options->toArray());
 });