PHP での WeChat 支払いの開始とクエリの実装

<?php
  require_once('WxPayApi.php');
  require_once('WxPayUnifiedOrder.php');
  
  $order = new WxPayUnifiedOrder();
  $order->SetBody('商品描述');
  $order->SetOut_trade_no('订单号');
  $order->SetTotal_fee('支付金额');
  $order->SetNotify_url('回调URL');
  $order->SetTrade_type('JSAPI');
  $order->SetOpenid('用户OpenID');
  
  $result = WxPayApi::unifiedOrder($order);

<?php
  require_once('WxPayApi.php');
  require_once('WxPayData.php');
  
  $input = new WxPayData();
  $input->SetBody('商品描述');
  $input->SetOut_trade_no('订单号');
  $input->SetTotal_fee('支付金额');
  $input->SetNotify_url('回调URL');
  $input->SetTrade_type('JSAPI');
  $input->SetOpenid('用户OpenID');
  
  $result = WxPayApi::unifiedOrder($input);
  $prepay_id = $result['prepay_id'];
  $params = [
    'appId' => $result['appid'],
    'timeStamp' => time(),
    'nonceStr' => $result['nonce_str'],
    'package' => "prepay_id={$prepay_id}",
    'signType' => 'MD5'
  ];
  $params['paySign'] = WxPayApi::getSign($params);

<?php
  echo '<script language="javascript">';
  echo 'WeixinJSBridge.invoke("getBrandWCPayRequest", {
    "appId":"'.$params['appId'].'",
    "timeStamp":"'.$params['timeStamp'].'",
    "nonceStr":"'.$params['nonceStr'].'",
    "package":"'.$params['package'].'",
    "signType":"'.$params['signType'].'",
    "paySign":"'.$params['paySign'].'"
  }, function(res){
    if(res.err_msg == "get_brand_wcpay_request:ok" ){
      alert("支付成功");
    }else{
      alert("支付失败");
    }
  });';
  echo '</script>';

<?php
  require_once('WxPayApi.php');
  
  $input = new WxPayOrderQuery();
  $input->SetOut_trade_no('订单号');
  
  $result = WxpayApi::orderQuery($input);
  if ($result['trade_state'] == 'SUCCESS') {
    echo '支付成功';
  } else {
    echo '支付失败';
  }