add services && controller && first configuration tree builder

BillingBundle/Controller/BillingController.php

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+<?php
+
+namespace Bluesquare\BillingBundle\Controller;
+
+use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+
+class BillingController extends AbstractController
+{
+    /**
+     * @Route("/bluesquare/billing-bundle/webhook", name="bluesquare.billing_bundle.webhook")
+    */
+    public function webhook()
+    {
+
+    }
+}

BillingBundle/DependencyInjection/BillingExtension.php

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+<?php
+
+namespace Bluesquare\BillingBundle\DependencyInjection;
+
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Extension\Extension;
+
+class BillingExtension extends Extension
+{
+    public function load(array $configs, ContainerBuilder $container)
+    {
+        $configuration = new Configuration();
+
+        $loader = new YamlFileLoader(
+            $container,
+            new FileLocator(__DIR__.'/../Resources/config')
+        );
+        $loader->load('services.yaml');
+
+        $this->addAnnotatedClassesToCompile([
+            'Bluesquare\\BillingBundle\\Controller\\'
+        ]);
+
+        $config = $this->processConfiguration($configuration, $configs);
+    }
+}

BillingBundle/DependencyInjection/Configuration.php

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+<?php
+
+namespace Acme\SocialBundle\DependencyInjection;
+
+use Symfony\Component\Config\Definition\Builder\TreeBuilder;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
+
+class Configuration implements ConfigurationInterface
+{
+    public function getConfigTreeBuilder()
+    {
+        $treeBuilder = new TreeBuilder('billing');
+
+        $treeBuilder->getRootNode()->children()
+            ->arrayNode('stripe')->children()
+                ->scalarNode('stripe_api_key_pub')->end()
+                ->scalarNode('stripe_api_key')->end()
+                ->scalarNode('stripe_webhook_key')->end()
+            ->end()
+        ->end();
+
+
+        return $treeBuilder;
+    }
+}

BillingBundle/Resources/services.yaml

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+services:
+    # default configuration for services in *this* file
+    _defaults:
+    autowire: true      # Automatically injects dependencies in your services.
+    autoconfigure: true # Automatically registers your services as commands, event subscribers, etc.

BillingBundle/Service.php

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+<?php
+
+namespace Bluesquare\BillingBundle\Service;
+
+class PaymentSrv
+{
+
+}

BillingBundle/Service/BillingSrv.php

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+<?php
+
+namespace Bluesquare\BillingBundle\Service;
+
+class BillingSrv
+{
+    public function createPurchase($arr)
+    {
+
+    }
+}