To install Site API first add it as a dependency to your project:

$ composer require netgen/ezplatform-site-api:^2.5

Once Site API is installed, activate the bundle in app/AppKernel.php file by adding it to the $bundles array in registerBundles() method, together with other required bundles:

public function registerBundles()

    $bundles[] = new Netgen\Bundle\EzPlatformSiteApiBundle\NetgenEzPlatformSiteApiBundle();
    $bundles[] = new Netgen\Bundle\EzPlatformSearchExtraBundle\NetgenEzPlatformSearchExtraBundle();

    return $bundles;

And that’s it. Once you finish the installation you will be able to use Site API services as you would normally do in a Symfony application. However, at this point Site API is not yet fully enabled. That is done per siteaccess, see Configuration page to learn more.