diff --git a/API.php b/API.php
index 6861d94..9311c6e 100644
--- a/API.php
+++ b/API.php
@@ -24,30 +24,30 @@
 class API extends \Piwik\Plugin\API
 {
     /**
-     * Get the pre-generated single OpenAPI spec file if it exists. This endpoint only reads
+     * Get a pre-generated OpenAPI spec file if it exists. This endpoint only reads
      * the generated JSON file and does not trigger spec generation.
      *
-     * /index.php?module=API&method=OpenApiDocs.getMatomoOpenApiSpec
+     * /index.php?module=API&method=OpenApiDocs.getOpenApiSpec&spec=CustomAlerts
      *
+     * @param string $pluginName Plugin name used in the generated filename.
      * @param string $format Output format. Only `json` is supported.
      * @return array<string, mixed> The decoded OpenAPI specification payload.
      * @throws \Exception If the file is missing, unreadable, or contains invalid JSON.
      */
-    public function getMatomoOpenApiSpec(string $format = 'json'): array
+    public function getOpenApiSpec(string $pluginName, string $format = 'json'): array
     {
         Piwik::checkUserHasSomeViewAccess();
 
-        if (strtolower($format) !== 'json') {
-            throw new \Exception(
-                Piwik::translate(
-                    'General_ExceptionInvalidReportRendererFormat',
-                    [$format, 'json']
-                )
-            );
-        }
+        $this->validateJsonFormat($format);
 
-        $filePath = $this->getMatomoSpecFilePath();
+        if (
+            !Manager::getInstance()->isValidPluginName($pluginName)
+            || !Manager::getInstance()->isPluginInFilesystem($pluginName)
+        ) {
+            throw new \Exception('Invalid plugin name: ' . $pluginName);
+        }
 
+        $filePath = $this->getSpecFilePath($pluginName);
         if (!$this->isSpecFileReadable($filePath)) {
             throw new \Exception('OpenAPI spec file was not found. Generate it first via openapidocs:generate-spec-file.');
         }
@@ -65,11 +65,11 @@ public function getMatomoOpenApiSpec(string $format = 'json'): array
         return $decodedSpec;
     }
 
-    protected function getMatomoSpecFilePath(): string
+    protected function getSpecFilePath(string $pluginName): string
     {
         $currentPluginDir = Manager::getInstance()::getPluginDirectory('OpenApiDocs');
 
-        return $currentPluginDir . OpenApiDocs::GENERATED_SPECS_PATH . 'matomo_openapi_spec_v' . OpenApiDocs::DEFAULT_SPEC_VERSION . '.json';
+        return $currentPluginDir . OpenApiDocs::GENERATED_SPECS_PATH . $pluginName . '_openapi_spec_v' . OpenApiDocs::DEFAULT_SPEC_VERSION . '.json';
     }
 
     protected function isSpecFileReadable(string $filePath): bool
@@ -86,6 +86,18 @@ protected function readSpecFile(string $filePath)
         return file_get_contents($filePath);
     }
 
+    protected function validateJsonFormat(string $format): void
+    {
+        if (strtolower($format) !== 'json') {
+            throw new \Exception(
+                Piwik::translate(
+                    'General_ExceptionInvalidReportRendererFormat',
+                    [$format, 'json']
+                )
+            );
+        }
+    }
+
     /**
      * Get the generated API documentation data for the specified plugin.
      *
diff --git a/tests/Unit/APITest.php b/tests/Unit/APITest.php
index a2b3c54..bcc49ce 100644
--- a/tests/Unit/APITest.php
+++ b/tests/Unit/APITest.php
@@ -43,54 +43,98 @@ protected function tearDown(): void
         parent::tearDown();
     }
 
-    public function testGetMatomoOpenApiSpecReturnsDecodedJson()
+    public function testGetOpenApiSpecReturnsDecodedJsonForPlugin()
     {
         $expectedSpec = [
             'openapi' => '3.1.0',
             'info' => [
-                'title' => 'Matomo Reporting API',
+                'title' => 'Matomo Reporting API for CustomAlerts plugin',
                 'version' => '1.0.0',
             ],
         ];
 
-        $api = $this->buildApiMock(true, json_encode($expectedSpec));
+        $api = $this->buildApiMock('/tmp/CustomAlerts_openapi_spec_v1.0.0.json', true, json_encode($expectedSpec));
 
-        $result = $api->getMatomoOpenApiSpec();
+        $result = $api->getOpenApiSpec('CustomAlerts');
 
         $this->assertSame($expectedSpec, $result);
     }
 
-    public function testGetMatomoOpenApiSpecThrowsExceptionWhenFileMissing()
+    public function testGetOpenApiSpecThrowsExceptionWhenFileMissing()
     {
-        $api = $this->buildApiMock(false);
+        $api = $this->buildApiMock('/tmp/CustomAlerts_openapi_spec_v1.0.0.json', false);
 
         $this->expectException(\Exception::class);
         $this->expectExceptionMessage('OpenAPI spec file was not found');
 
-        $api->getMatomoOpenApiSpec();
+        $api->getOpenApiSpec('CustomAlerts');
     }
 
-    public function testGetMatomoOpenApiSpecThrowsExceptionWhenJsonIsInvalid()
+    public function testGetOpenApiSpecThrowsExceptionWhenJsonIsInvalid()
     {
-        $api = $this->buildApiMock(true, '{invalid json}');
+        $api = $this->buildApiMock('/tmp/CustomAlerts_openapi_spec_v1.0.0.json', true, '{invalid json}');
 
         $this->expectException(\Exception::class);
         $this->expectExceptionMessage('OpenAPI spec file contains invalid JSON');
 
-        $api->getMatomoOpenApiSpec();
+        $api->getOpenApiSpec('CustomAlerts');
     }
 
+    public function testGetOpenApiSpecThrowsExceptionWhenFormatIsInvalid()
+    {
+        $api = $this->buildApiMock('/tmp/CustomAlerts_openapi_spec_v1.0.0.json', true, '{}');
+
+        $this->expectException(\Exception::class);
+        $this->expectExceptionMessage('General_ExceptionInvalidReportRendererFormat');
+
+        $api->getOpenApiSpec('CustomAlerts', 'yaml');
+    }
+
+    public function testGetOpenApiSpecThrowsExceptionWhenSpecIsNotAValidPlugin()
+    {
+        $api = new API();
+
+        $this->expectException(\Exception::class);
+        $this->expectExceptionMessage('Invalid plugin name: DefinitelyNotARealPlugin');
+
+        $api->getOpenApiSpec('DefinitelyNotARealPlugin');
+    }
+
+    public function testGetSpecFilePathUsesPluginSpecificFileName()
+    {
+        $api = new API();
+
+        $this->assertSame(
+            PIWIK_INCLUDE_PATH . '/plugins/OpenApiDocs/tmp/specs/CustomAlerts_openapi_spec_v1.0.0.json',
+            $this->callProtectedMethod($api, 'getSpecFilePath', ['CustomAlerts'])
+        );
+    }
 
-    private function buildApiMock(bool $isReadable, $fileContents = false): API
+
+    private function buildApiMock(string $filePath, bool $isReadable, $fileContents = false): API
     {
         $api = $this->getMockBuilder(API::class)
-            ->onlyMethods(['getMatomoSpecFilePath', 'isSpecFileReadable', 'readSpecFile'])
+            ->onlyMethods(['getSpecFilePath', 'isSpecFileReadable', 'readSpecFile'])
             ->getMock();
 
-        $api->method('getMatomoSpecFilePath')->willReturn('/tmp/matomo_openapi_spec_v1.0.0.json');
+        $api->method('getSpecFilePath')->willReturn($filePath);
         $api->method('isSpecFileReadable')->willReturn($isReadable);
         $api->method('readSpecFile')->willReturn($fileContents);
 
         return $api;
     }
+
+    /**
+     * @param object $object
+     * @param string $methodName
+     * @param array<int, mixed> $arguments
+     * @return mixed
+     */
+    private function callProtectedMethod($object, string $methodName, array $arguments = [])
+    {
+        $reflection = new \ReflectionMethod($object, $methodName);
+        $reflection->setAccessible(true);
+
+        return $reflection->invokeArgs($object, $arguments);
+    }
 }