使用codeIgniter使用内容类型application / x-www-form-urlencode创建curl get请求的正确方法是什么

Question

Here's my request method. I use cURL to get data from requested link.

get request

<?php

    $curl = curl_init();

    curl_setopt_array($curl, array(
      CURLOPT_URL => "",  //URL here
      CURLOPT_RETURNTRANSFER => true,
      CURLOPT_ENCODING => "",
      CURLOPT_MAXREDIRS => 10,
      CURLOPT_TIMEOUT => 30,
      CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
      CURLOPT_CUSTOMREQUEST => "GET",
      CURLOPT_POSTFIELDS => "msgID=aee68d26fdf847b4bed98b532af15f4b&grabID=7ebd8022-8f85-4986-b8bb-4b65aab03f24&terminalID=1a5bf6d4668e4f31a98bce18c&currency=SGD&txType=P2M&partnerTxID=N71AMM7KGT&undefined=",
      CURLOPT_HTTPHEADER => array(
        "Authorization: $secret:1ZCiCYXXNnIFM8hKZZxrL8jztk+qNMGq17534bbdqd0=",
        "Content-Type: application/json",
        "Date: Wed, 13 Feb 2019 01:39:07 GMT",
        "Postman-Token: afc43fd5-0844-4d52-9f6d-f442d6934781",
        "cache-control: no-cache"
      ),
    ));

    $response = curl_exec($curl);
    $err = curl_error($curl);

    curl_close($curl);

    if ($err) {
      echo "cURL Error #:" . $err;
    } else {`enter code here`
      echo $response;
    }

Can someone enlighten me what can do about it with the use of cURL? Thank you for the help!