贝宝订单API模式

我正在使用PayPal结帐按钮和Paypal Orders API V2设置付款集成。付款即将到来，但现在我想在“订单”请求中包含商品，但得到：

正如贝宝（PayPal）的文档所说，我必须将array (contains the item object) 链接 传递到订单API Purchase_unit对象链接到订单API物品对象。但我仍然收到此错误。
这是我的要求：

public function createOrder($value, $order, $products, $currency = 'EUR')
    {
      return $this->makeRequest(
        'POST',
        '/v2/checkout/orders',
        [],
        [
          'intent' => 'CAPTURE',
          'payer' => [
            'name' => [
              'given_name' => $order->billing_firstname,
              'surname' => $order->billing_lastname
            ],
            'email_address' => $order->email_address,
            'address' => [
              'address_line_1' => $order->billing_street_address,
              'admin_area_2' => $order->billing_city,
              'postal_code' => $order->billing_postcode,
              'country_code' => $order->billing_country_code
            ],
          ],
          'purchase_units' => [
            0 => [
              'amount' => [
                'currency_code' => $currency,
                'value' => $value,
              ],
              'description' => 'Order: ' . $order->order_serial_number,

              'items' => [
                0 => [
                  'name' => 'Item1',
                  'unit_amount' => 100,
                  'quantity' => 1
                ],
              ],
            ],
          ],
          'application_context' => [
              'brand_name' => config('app.name'),
              'shipping_preference' => 'NO_SHIPPING',
              'user_action' => 'PAY_NOW',
              'return_url' => route('approval.paypal', $order->id_order),
              'cancel_url' => route('payment.cancelled', $order->id_order),
          ]
        ],
        [],
        $isJsonRequest = true
      );
    }

我正在使用：Laravel和Guzzle / HTTP执行付款请求。

就像我说的那样，付款会抛出，但是当我尝试将商品添加到订单时，出现了此错误。