diff --git a/src/Handler/PackageHandler.php b/src/Handler/PackageHandler.php
new file mode 100644
index 0000000..e61b047
--- /dev/null
+++ b/src/Handler/PackageHandler.php
@@ -0,0 +1,51 @@
+<?php
+
+namespace LastCall\DownloadsPlugin\Handler;
+
+use Composer\Composer;
+use Composer\DependencyResolver\Operation\InstallOperation;
+use Composer\IO\IOInterface;
+use Composer\Json\JsonFile;
+use Composer\Package\PackageInterface;
+use Composer\Package\RootPackageInterface;
+use Composer\Repository\InstalledRepositoryInterface;
+use LastCall\DownloadsPlugin\Composer\Repository\ExtraDownloadsRepository;
+use LastCall\DownloadsPlugin\Parser\Parser;
+use LastCall\DownloadsPlugin\Parser\ParserInterface;
+
+class PackageHandler implements PackageHandlerInterface
+{
+    private ParserInterface $parser;
+    private InstalledRepositoryInterface $repository;
+
+    public function __construct(
+        private Composer $composer,
+        private IOInterface $io,
+        ?ParserInterface $parser = null,
+        ?InstalledRepositoryInterface $repository = null,
+    ) {
+        $this->parser = $parser ?? new Parser($this->io);
+        $vendorDir = $this->composer->getConfig()->get('vendor-dir');
+        $this->repository = $repository ?? new ExtraDownloadsRepository(new JsonFile($vendorDir.'/composer/installed-extra-downloads.json', null, $this->io));
+    }
+
+    public function handle(PackageInterface $package): void
+    {
+        $installationManager = $this->composer->getInstallationManager();
+        $extraDownloads = array_filter(
+            $this->parser->parse($package),
+            fn (PackageInterface $extraDownload) => !$installationManager->isPackageInstalled($this->repository, $extraDownload)
+        );
+        if (empty($extraDownloads)) {
+            return;
+        }
+        $operations = array_map(
+            fn (PackageInterface $extraDownload) => new InstallOperation($extraDownload),
+            array_values($extraDownloads)
+        );
+        $installationManager->execute($this->repository, $operations, false, false);
+        if (!$package instanceof RootPackageInterface) {
+            $installationManager->ensureBinariesPresence($package);
+        }
+    }
+}
diff --git a/src/Handler/PackageHandlerInterface.php b/src/Handler/PackageHandlerInterface.php
new file mode 100644
index 0000000..4331fcb
--- /dev/null
+++ b/src/Handler/PackageHandlerInterface.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace LastCall\DownloadsPlugin\Handler;
+
+use Composer\Package\PackageInterface;
+
+interface PackageHandlerInterface
+{
+    public function handle(PackageInterface $package): void;
+}
diff --git a/tests/Unit/Handler/PackageHandlerTest.php b/tests/Unit/Handler/PackageHandlerTest.php
new file mode 100644
index 0000000..99f0c17
--- /dev/null
+++ b/tests/Unit/Handler/PackageHandlerTest.php
@@ -0,0 +1,160 @@
+<?php
+
+namespace LastCall\DownloadsPlugin\Tests\Unit\Handler;
+
+use Composer\Composer;
+use Composer\DependencyResolver\Operation\InstallOperation;
+use Composer\Installer\InstallationManager;
+use Composer\IO\IOInterface;
+use Composer\Package\Package;
+use Composer\Package\PackageInterface;
+use Composer\Package\RootPackage;
+use Composer\Repository\InstalledRepositoryInterface;
+use LastCall\DownloadsPlugin\Composer\Package\ExtraDownloadInterface;
+use LastCall\DownloadsPlugin\Handler\PackageHandler;
+use LastCall\DownloadsPlugin\Handler\PackageHandlerInterface;
+use LastCall\DownloadsPlugin\Parser\ParserInterface;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+
+class PackageHandlerTest extends TestCase
+{
+    private Composer|MockObject $composer;
+    private IOInterface|MockObject $io;
+    protected ParserInterface|MockObject $parser;
+    protected InstalledRepositoryInterface|MockObject $repository;
+    private InstallationManager|MockObject $installationManager;
+    private PackageHandlerInterface $handler;
+
+    protected function setUp(): void
+    {
+        $this->composer = $this->createMock(Composer::class);
+        $this->io = $this->createMock(IOInterface::class);
+        $this->parser = $this->createMock(ParserInterface::class);
+        $this->repository = $this->createMock(InstalledRepositoryInterface::class);
+        $this->installationManager = $this->createMock(InstallationManager::class);
+        $this->handler = new PackageHandler(
+            $this->composer,
+            $this->io,
+            $this->parser,
+            $this->repository
+        );
+    }
+
+    public function testHandleEmptyExtraDownloads(): void
+    {
+        $package = $this->createMock(PackageInterface::class);
+        $this->composer
+            ->expects($this->once())
+            ->method('getInstallationManager')
+            ->willReturn($this->installationManager);
+        $this->parser
+            ->expects($this->once())
+            ->method('parse')
+            ->with($package)
+            ->willReturn([]);
+        $this->installationManager
+            ->expects($this->never())
+            ->method('isPackageInstalled');
+        $this->installationManager
+            ->expects($this->never())
+            ->method('execute');
+        $this->installationManager
+            ->expects($this->never())
+            ->method('ensureBinariesPresence');
+        $this->handler->handle($package);
+    }
+
+    public function testHandleAllExtraDownloadsInstalled(): void
+    {
+        $package = $this->createMock(PackageInterface::class);
+        $this->composer
+            ->expects($this->once())
+            ->method('getInstallationManager')
+            ->willReturn($this->installationManager);
+        $this->parser
+            ->expects($this->once())
+            ->method('parse')
+            ->with($package)
+            ->willReturn([
+                $extraDownload1 = $this->createMock(ExtraDownloadInterface::class),
+                $extraDownload2 = $this->createMock(ExtraDownloadInterface::class),
+                $extraDownload3 = $this->createMock(ExtraDownloadInterface::class),
+            ]);
+        $this->installationManager
+            ->expects($this->exactly(3))
+            ->method('isPackageInstalled')
+            ->withConsecutive(
+                [$this->repository, $extraDownload1],
+                [$this->repository, $extraDownload2],
+                [$this->repository, $extraDownload3]
+            )
+            ->willReturn(true);
+        $this->installationManager
+            ->expects($this->never())
+            ->method('execute');
+        $this->installationManager
+            ->expects($this->never())
+            ->method('ensureBinariesPresence');
+        $this->handler->handle($package);
+    }
+
+    public function getHandleTests(): array
+    {
+        return [
+            [new Package('vendor/library-name', '1.0.0', 'v1.0.0'), true],
+            [new RootPackage('my-organization/my-project', '1.2.3', 'v1.2.3'), false],
+        ];
+    }
+
+    /**
+     * @dataProvider getHandleTests
+     */
+    public function testHandle(PackageInterface $package, bool $ensureBinariesPresence): void
+    {
+        $this->composer
+            ->expects($this->once())
+            ->method('getInstallationManager')
+            ->willReturn($this->installationManager);
+        $this->parser
+            ->expects($this->once())
+            ->method('parse')
+            ->with($package)
+            ->willReturn([
+                $extraDownload1 = $this->createMock(ExtraDownloadInterface::class),
+                $extraDownload2 = $this->createMock(ExtraDownloadInterface::class),
+                $extraDownload3 = $this->createMock(ExtraDownloadInterface::class),
+            ]);
+        $this->installationManager
+            ->expects($this->exactly(3))
+            ->method('isPackageInstalled')
+            ->withConsecutive(
+                [$this->repository, $extraDownload1],
+                [$this->repository, $extraDownload2],
+                [$this->repository, $extraDownload3]
+            )
+            ->willReturnOnConsecutiveCalls(false, true, false);
+        $this->installationManager
+            ->expects($this->once())
+            ->method('execute')
+            ->with(
+                $this->repository,
+                $this->callback(function (array $operations) use ($extraDownload1, $extraDownload3) {
+                    $this->assertCount(2, $operations);
+                    $this->assertInstanceOf(InstallOperation::class, $operations[0]);
+                    $this->assertSame($extraDownload1, $operations[0]->getPackage());
+                    $this->assertInstanceOf(InstallOperation::class, $operations[1]);
+                    $this->assertSame($extraDownload3, $operations[1]->getPackage());
+
+                    return true;
+                }),
+                false,
+                false,
+            );
+        $this->installationManager
+            ->expects($this->exactly($ensureBinariesPresence))
+            ->method('ensureBinariesPresence')
+            ->with($package);
+        $this->handler->handle($package);
+    }
+}