diff --git a/CLAUDE.md b/CLAUDE.md
index bf8d936..118a045 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -49,7 +49,8 @@ This is a PHP library (`studio-design/openapi-contract-testing`) that validates
 
 ### Laravel Integration
 
-- **`ValidatesOpenApiSchema`** trait — Used in Laravel test cases. Provides `assertResponseMatchesOpenApiSchema()` which auto-resolves method/path from the current request and records coverage. Requires implementing `openApiSpec(): string` to specify which spec to validate against.
+- **`ValidatesOpenApiSchema`** trait — Used in Laravel test cases. Provides `assertResponseMatchesOpenApiSchema()` which auto-resolves method/path from the current request and records coverage. The default spec name is read from `config('openapi-contract-testing.default_spec')`; override `openApiSpec(): string` per-test-class if needed.
+- **`OpenApiContractTestingServiceProvider`** — Auto-discovered service provider that registers and publishes the `openapi-contract-testing` config file (`default_spec` key).
 
 ### Key Enums
 
diff --git a/composer.json b/composer.json
index c95d050..3a8395a 100644
--- a/composer.json
+++ b/composer.json
@@ -33,6 +33,13 @@
             "dealerdirect/phpcodesniffer-composer-installer": true
         }
     },
+    "extra": {
+        "laravel": {
+            "providers": [
+                "Studio\\OpenApiContractTesting\\Laravel\\OpenApiContractTestingServiceProvider"
+            ]
+        }
+    },
     "minimum-stability": "stable",
     "prefer-stable": true
 }
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index 2d8f8fc..33debca 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -6,16 +6,22 @@ parameters:
     tmpDir: .phpstan.cache
     ignoreErrors:
         -
-            message: '#Function app not found#'
+            message: '#Function (app|config) not found#'
             path: src/Laravel/ValidatesOpenApiSchema.php
         -
             message: '#Call to an undefined method Illuminate\\Testing\\TestResponse::#'
             path: src/Laravel/ValidatesOpenApiSchema.php
+        -
+            message: '#Function config_path not found#'
+            path: src/Laravel/OpenApiContractTestingServiceProvider.php
         -
             message: '#does not specify its types: TResponse#'
             paths:
                 - src/Laravel/ValidatesOpenApiSchema.php
                 - tests/Unit/ValidatesOpenApiSchemaTest.php
+                - tests/Unit/ValidatesOpenApiSchemaDefaultSpecTest.php
         -
             message: '#expects TResponse of Symfony\\Component\\HttpFoundation\\Response#'
-            path: tests/Unit/ValidatesOpenApiSchemaTest.php
+            paths:
+                - tests/Unit/ValidatesOpenApiSchemaTest.php
+                - tests/Unit/ValidatesOpenApiSchemaDefaultSpecTest.php
diff --git a/src/Laravel/OpenApiContractTestingServiceProvider.php b/src/Laravel/OpenApiContractTestingServiceProvider.php
new file mode 100644
index 0000000..c946e05
--- /dev/null
+++ b/src/Laravel/OpenApiContractTestingServiceProvider.php
@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Studio\OpenApiContractTesting\Laravel;
+
+use Illuminate\Support\ServiceProvider;
+
+class OpenApiContractTestingServiceProvider extends ServiceProvider
+{
+    public function register(): void
+    {
+        $this->mergeConfigFrom(__DIR__ . '/config.php', 'openapi-contract-testing');
+    }
+
+    public function boot(): void
+    {
+        $this->publishes([
+            __DIR__ . '/config.php' => config_path('openapi-contract-testing.php'),
+        ], 'openapi-contract-testing');
+    }
+}
diff --git a/src/Laravel/ValidatesOpenApiSchema.php b/src/Laravel/ValidatesOpenApiSchema.php
index 52e405f..fdc5e01 100644
--- a/src/Laravel/ValidatesOpenApiSchema.php
+++ b/src/Laravel/ValidatesOpenApiSchema.php
@@ -9,9 +9,20 @@
 use Studio\OpenApiContractTesting\OpenApiCoverageTracker;
 use Studio\OpenApiContractTesting\OpenApiResponseValidator;
 
+use function is_string;
+
 trait ValidatesOpenApiSchema
 {
-    abstract protected function openApiSpec(): string;
+    protected function openApiSpec(): string
+    {
+        $spec = config('openapi-contract-testing.default_spec');
+
+        if (!is_string($spec) || $spec === '') {
+            return '';
+        }
+
+        return $spec;
+    }
 
     protected function assertResponseMatchesOpenApiSchema(
         TestResponse $response,
@@ -20,7 +31,11 @@ protected function assertResponseMatchesOpenApiSchema(
     ): void {
         $specName = $this->openApiSpec();
         if ($specName === '') {
-            $this->fail('openApiSpec() must return a non-empty spec name, but an empty string was returned.');
+            $this->fail(
+                'openApiSpec() must return a non-empty spec name, but an empty string was returned. '
+                . 'Either override openApiSpec() in your test class, or set the "default_spec" key '
+                . 'in config/openapi-contract-testing.php.',
+            );
         }
 
         $resolvedMethod = $method !== null ? $method->value : app('request')->getMethod();
diff --git a/src/Laravel/config.php b/src/Laravel/config.php
new file mode 100644
index 0000000..d9cf9f4
--- /dev/null
+++ b/src/Laravel/config.php
@@ -0,0 +1,7 @@
+<?php
+
+declare(strict_types=1);
+
+return [
+    'default_spec' => '',
+];
diff --git a/tests/Helpers/CreatesTestResponse.php b/tests/Helpers/CreatesTestResponse.php
new file mode 100644
index 0000000..06afbb7
--- /dev/null
+++ b/tests/Helpers/CreatesTestResponse.php
@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Studio\OpenApiContractTesting\Tests\Helpers;
+
+use Illuminate\Testing\TestResponse;
+
+trait CreatesTestResponse
+{
+    private function makeTestResponse(string $content, int $statusCode): TestResponse
+    {
+        $baseResponse = new class ($content, $statusCode) {
+            public function __construct(
+                private readonly string $content,
+                private readonly int $statusCode,
+            ) {}
+
+            public function getContent(): string
+            {
+                return $this->content;
+            }
+
+            public function getStatusCode(): int
+            {
+                return $this->statusCode;
+            }
+        };
+
+        return new TestResponse($baseResponse);
+    }
+}
diff --git a/tests/Helpers/LaravelConfigMock.php b/tests/Helpers/LaravelConfigMock.php
new file mode 100644
index 0000000..eefe1ac
--- /dev/null
+++ b/tests/Helpers/LaravelConfigMock.php
@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Studio\OpenApiContractTesting\Laravel;
+
+/**
+ * Namespace-level config() mock for unit testing.
+ *
+ * This library does not depend on laravel/framework, so the global \config()
+ * helper is unavailable during unit tests. This namespaced function acts as a
+ * lightweight substitute.
+ *
+ * PHP resolves unqualified function calls by checking the current namespace first,
+ * then falling back to the global namespace. Because the ValidatesOpenApiSchema trait
+ * lives in Studio\OpenApiContractTesting\Laravel and calls config() without a leading
+ * backslash, this function takes priority over any global \config() that might exist
+ * at runtime.
+ *
+ * IMPORTANT: This relies on config() being called as an unqualified function
+ * in ValidatesOpenApiSchema.php (i.e., no "use function config" import).
+ * Adding such an import would bypass namespace resolution and break this mock.
+ *
+ * Test values are read from $GLOBALS['__openapi_testing_config'].
+ */
+function config(string $key, mixed $default = null): mixed
+{
+    return $GLOBALS['__openapi_testing_config'][$key] ?? $default;
+}
diff --git a/tests/Unit/ValidatesOpenApiSchemaDefaultSpecTest.php b/tests/Unit/ValidatesOpenApiSchemaDefaultSpecTest.php
new file mode 100644
index 0000000..a6eb5fc
--- /dev/null
+++ b/tests/Unit/ValidatesOpenApiSchemaDefaultSpecTest.php
@@ -0,0 +1,103 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Studio\OpenApiContractTesting\Tests\Unit;
+
+use const JSON_THROW_ON_ERROR;
+
+use PHPUnit\Framework\AssertionFailedError;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\TestCase;
+use Studio\OpenApiContractTesting\HttpMethod;
+use Studio\OpenApiContractTesting\Laravel\ValidatesOpenApiSchema;
+use Studio\OpenApiContractTesting\OpenApiCoverageTracker;
+use Studio\OpenApiContractTesting\OpenApiSpecLoader;
+use Studio\OpenApiContractTesting\Tests\Helpers\CreatesTestResponse;
+
+use function json_encode;
+
+// Load namespace-level config() mock before the trait resolves the function call.
+require_once __DIR__ . '/../Helpers/LaravelConfigMock.php';
+
+class ValidatesOpenApiSchemaDefaultSpecTest extends TestCase
+{
+    use CreatesTestResponse;
+    use ValidatesOpenApiSchema;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        OpenApiSpecLoader::reset();
+        OpenApiSpecLoader::configure(__DIR__ . '/../fixtures/specs');
+        OpenApiCoverageTracker::reset();
+        $GLOBALS['__openapi_testing_config'] = [];
+    }
+
+    protected function tearDown(): void
+    {
+        unset($GLOBALS['__openapi_testing_config']);
+        OpenApiSpecLoader::reset();
+        OpenApiCoverageTracker::reset();
+        parent::tearDown();
+    }
+
+    #[Test]
+    public function default_open_api_spec_returns_empty_string_when_config_not_set(): void
+    {
+        $this->assertSame('', $this->openApiSpec());
+    }
+
+    #[Test]
+    public function default_open_api_spec_returns_config_value(): void
+    {
+        $GLOBALS['__openapi_testing_config']['openapi-contract-testing.default_spec'] = 'petstore-3.0';
+
+        $this->assertSame('petstore-3.0', $this->openApiSpec());
+    }
+
+    #[Test]
+    public function null_config_value_returns_empty_string(): void
+    {
+        $GLOBALS['__openapi_testing_config']['openapi-contract-testing.default_spec'] = null;
+
+        $this->assertSame('', $this->openApiSpec());
+    }
+
+    #[Test]
+    public function empty_config_default_spec_fails_with_clear_message(): void
+    {
+        $response = $this->makeTestResponse('{}', 200);
+
+        $this->expectException(AssertionFailedError::class);
+        $this->expectExceptionMessage(
+            'openApiSpec() must return a non-empty spec name, but an empty string was returned. '
+            . 'Either override openApiSpec() in your test class, or set the "default_spec" key '
+            . 'in config/openapi-contract-testing.php.',
+        );
+
+        $this->assertResponseMatchesOpenApiSchema(
+            $response,
+            HttpMethod::GET,
+            '/v1/pets',
+        );
+    }
+
+    #[Test]
+    public function configured_default_spec_validates_successfully(): void
+    {
+        $GLOBALS['__openapi_testing_config']['openapi-contract-testing.default_spec'] = 'petstore-3.0';
+
+        $body = (string) json_encode(
+            ['data' => [['id' => 1, 'name' => 'Fido', 'tag' => null]]],
+            JSON_THROW_ON_ERROR,
+        );
+        $response = $this->makeTestResponse($body, 200);
+
+        $this->assertResponseMatchesOpenApiSchema(
+            $response,
+            HttpMethod::GET,
+            '/v1/pets',
+        );
+    }
+}
diff --git a/tests/Unit/ValidatesOpenApiSchemaTest.php b/tests/Unit/ValidatesOpenApiSchemaTest.php
index 3d3466e..6038d34 100644
--- a/tests/Unit/ValidatesOpenApiSchemaTest.php
+++ b/tests/Unit/ValidatesOpenApiSchemaTest.php
@@ -6,7 +6,6 @@
 
 use const JSON_THROW_ON_ERROR;
 
-use Illuminate\Testing\TestResponse;
 use PHPUnit\Framework\AssertionFailedError;
 use PHPUnit\Framework\Attributes\Test;
 use PHPUnit\Framework\TestCase;
@@ -14,11 +13,13 @@
 use Studio\OpenApiContractTesting\Laravel\ValidatesOpenApiSchema;
 use Studio\OpenApiContractTesting\OpenApiCoverageTracker;
 use Studio\OpenApiContractTesting\OpenApiSpecLoader;
+use Studio\OpenApiContractTesting\Tests\Helpers\CreatesTestResponse;
 
 use function json_encode;
 
 class ValidatesOpenApiSchemaTest extends TestCase
 {
+    use CreatesTestResponse;
     use ValidatesOpenApiSchema;
 
     protected function setUp(): void
@@ -146,26 +147,4 @@ protected function openApiSpec(): string
     {
         return 'petstore-3.0';
     }
-
-    private function makeTestResponse(string $content, int $statusCode): TestResponse
-    {
-        $baseResponse = new class ($content, $statusCode) {
-            public function __construct(
-                private readonly string $content,
-                private readonly int $statusCode,
-            ) {}
-
-            public function getContent(): string
-            {
-                return $this->content;
-            }
-
-            public function getStatusCode(): int
-            {
-                return $this->statusCode;
-            }
-        };
-
-        return new TestResponse($baseResponse);
-    }
 }