我已参透了PayPal。

@@ -73,6 +73,8 @@ class OrderController extends Controller
             return DB::transaction(function ()use ($user_id, $member_id, $source, $number){
                 // 获取商品信息
                 $membership_good = MembershipGood::query()->where('id',$member_id)->first();
+                if (!$membership_good) throw new \Exception('没有此商品');
+
                 $membership = $membership_good->membership()->first();
 
                 // 实付金额 = 商品金额

@@ -37,18 +37,25 @@ class PayController extends Controller
      */
     public function store(Request $request)
     {
-        //
+        // 回调
     }
 
     /**
      * Display the specified resource.
      *
      * @param  int  $id
-     * @return \Illuminate\Http\Response
+     * @param Request $request
+     * @param PaymentFactory $factory
+     * @return \Illuminate\Http\JsonResponse
+     * @throws \Exception
      */
-    public function show($id)
+    public function show($id, Request $request, PaymentFactory $factory)
     {
-        //
+        $pay_type = $request->get('pay_type');
+
+        $capture = $factory->init($pay_type)->capture($id);
+
+        return Response::success($capture);
     }
 
     /**

@@ -17,11 +17,10 @@ class PaypalPayment implements PaymentInterface
 
     const IS_SANDBOX = true;
 
-    public $authUrl = 'https://api-m.sandbox.paypal.com/v1/oauth2/token';
+    public $baseUrl = 'https://api-m.paypal.com';
 
-    public $paySandboxUrl = 'https://api-m.sandbox.paypal.com';
+    public $baseUrlSandbox = 'https://api-m.sandbox.paypal.com';
 
-    public $payUrl = 'https://api-m.paypal.com';
 
     public $clientId = 'AdDRE91WSp5q1fYLODpJduc2mRjA_v6E205SvkfVSOgvr98xLeyDCHY4OPAaSFMK1SHYOfJ4TksHSX1-';
     public $secret = 'EDoy_PVrFyobWt9DzAMRMikJwWCXenkWSx9CGFz0MxHt3a8fs6v-LnORMilIbftb2GwBKxOoTVZNBHNR';
@@ -38,13 +37,14 @@ class PaypalPayment implements PaymentInterface
             $this->accessToken = $access_token;
         }else{
             $client = new Client([
+                'base_uri' => $this->baseUrlSandbox,
                 'headers'=>[
                     'Content-Type' => 'application/x-www-form-urlencoded',
                     'Accept'=>'application/json',
                 ]
             ]);
 
-            $response = $client->post($this->authUrl,[
+            $response = $client->post('/v1/oauth2/token',[
                 'form_params'=>['grant_type' => 'client_credentials'],
                 'auth' => [$this->clientId, $this->secret],
             ]);
@@ -56,11 +56,87 @@ class PaypalPayment implements PaymentInterface
         }
     }
 
+    /**
+     * Setting up the JSON request body for creating the Order. The Intent in the
+     * request body should be set as "CAPTURE" for capture intent flow.
+     * @param  Order $order
+     * @return array
+     */
+    private static function buildCreateOrderRequestBody(Order $order)
+    {
+        return array(
+            'intent' => 'CAPTURE',    //CAPTURE 商家打算在客户付款后立即扣款。 AUTHORIZE 商家打算在客户付款后授权付款并暂停资金
+            'application_context' =>
+                array(
+                    'return_url' => 'https://example.com/return',    // todo
+                    'cancel_url' => 'https://example.com/cancel',    // todo 这里要询问reason app是否有schema，
+                    'brand_name' => 'Parlando',    //覆盖 PayPal 网站上 PayPal 帐户中公司名称的标签。
+                    'locale' => 'en-US',    //zh-CN
+                    'landing_page' => 'NO_PREFERENCE',    //LOGIN / BILLING / NO_PREFERENCE
+                    'shipping_preference' => 'NO_SHIPPING',    //运输偏好
+                    'user_action' => 'PAY_NOW',
+                ),
+            'purchase_units' =>
+                array(
+                    0 =>
+                        array(
+                            'description' => 'Parlando 3 Month Vip',   // 购买说明
+                            'custom_id' => 'osnxxxxxx123',    //API 调用者提供的外部 ID  可以理解为order_id  osnxxxxxx
+                            'soft_descriptor' => 'PayPal Parlando Vip',    // 出现在付款人卡对帐单上的对帐单描述符的动态文本 最大长度：22.
+                            'amount' =>
+                                array(
+                                    'currency_code' => 'USD',   // CNY
+                                    'value' => '220.00',    //
+                                ),
+                        ),
+                ),
+        );
+    }
+
     public function prepare(Order $order)
     {
         // 在PayPal上创建一个订单，它会返回一个订单对象，它有一个订单id
+        $client = new Client([
+            'base_uri' => $this->baseUrlSandbox,
+            'headers'=>[
+                'Content-Type' => 'application/json',
+                'Authorization' => 'Bearer ' . $this->accessToken,
+                'Prefer' => 'return=representation',
+            ]
+        ]);
+
+        $response = $client->post('/v2/checkout/orders',[
+            'json' => self::buildCreateOrderRequestBody($order),
+        ]);
+        $body = $response->getBody();
+        $content = json_decode($body->getContents(),true);
+
+        return $content;
+    }
+
+    public function capture($orderId)
+    {
+        $client = new Client([
+            'base_uri' => $this->baseUrlSandbox,
+            'headers'=>[
+                'Content-Type' => 'application/json',
+                'Authorization' => 'Bearer ' . $this->accessToken,
+                'Prefer' => 'return=representation',
+            ]
+        ]);
+
+        $response = $client->post('/v2/checkout/orders/' . $orderId . '/capture');
+        $body = $response->getBody();
+        $content = json_decode($body->getContents(),true);
+
+
+        // todo 应该使用队列，异步执行回调程序
 
+        return $content;
+    }
+
+    public function notify()
+    {
 
-        return $this->accessToken;
     }
 }
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