微信支付V3版需要用到这个Sodium解密，所以需要用到这个

$result = file_get_contents('php://input');
if($result){
    $result = json_decode($result, true);
    $text = base64_decode($result['resource']['ciphertext']); //解密
    /* =========== 使用V3支付需要PHP7.2.6安装sodium扩展才能进行解密参数  ================ */
    $str = sodium_crypto_aead_aes256gcm_decrypt($text, $result['resource']['associated_data'], $result['resource']['nonce'], $cfg_WechatPay_V3Key);
    echo $str;
    $res = json_decode($str, true);
    //如果成功返回了
    if($res['trade_state'] == 'SUCCESS'){
        echo "out_trade_no：".$res['out_trade_no']."<br>";
        echo "transaction_id：".$res['transaction_id']."<br>";
        echo "success_time：".$res['success_time']."<br>";
        echo "attach：".$res['attach']."<br>";
        echo "total：".$res['amount']["total"]."<br>";
    }
}