参数 Volley POST 请求中的数组

如何解决参数 Volley POST 请求中的数组

我有这样的 API 响应：

"data": {
   "reference": "T0001000000000000006","merchant_ref": "INV345675","status": "UNPAID","expired_time": 1582855837,"order_items": [
     {
       "sku": "PRODUK1","name": "Nama Produk 1","price": 500000,"quantity": 1,"subtotal": 500000
  }
],

这是我的获取参数：

@Override
        protected Map<String,String> getParams()
        {
            ArrayList<String> orderItems = new ArrayList<String>();
            orderItems.add("1");
            orderItems.add("Saldo Tripay");
            orderItems.add(String.valueOf(getIntent().getIntExtra("amount",0)));
            orderItems.add(String.valueOf(1));

            Map<String,String>  params = new HashMap<String,String>();
            params.put("method",getIntent().getStringExtra("code"));
            params.put("merchant_ref",String.valueOf(merchantRefFinal));
            params.put("amount",String.valueOf(getIntent().getIntExtra("amount",0)));
            params.put("customer_name",custName);
            params.put("customer_email",custemail);
            params.put("customer_phone",custPhone);
            for(String object: orderItems){
                params.put("order_items[]",object);
            }
            params.put("signature",signature);


            return params;
        }

我想要的是，使用 POST 在“order_items”上发送参数 我已经尝试了很多教程，但仍然失败 有人可以帮我吗？

下面是PHP中的请求示例：

  $data = [
  'method'            => 'BRIVA','merchant_ref'      => $merchantRef,'amount'            => $amount,'customer_name'     => 'Nama Pelanggan','customer_email'    => '[e-mail]','customer_phone'    => '081234567890','order_items'       => [
    [
      'sku'       => 'PRODUK1','name'      => 'Nama Produk 1','price'     => $amount,'quantity'  => 1
    ]
  ],'callback_url'      => 'https://domainanda.com/callback','return_url'        => 'https://domainanda.com/redirect','expired_time'      => (time()+(24*60*60)),// 24 jam
  'signature'         => hash_hmac('sha256',$merchantCode.$merchantRef.$amount,$privateKey)
];

请有人帮忙解决这个问题，我被困在其中。