Callback Transaksi Pulsa Diamond Pedia

<?php
require("config.php");

$ip_dpedia = "172.105.239.47";
$ipv6_dpedia = '2400:8902::f03c:91ff:fe31:756';

if( $_SERVER['REMOTE_ADDR'] == $ip_dpedia || $_SERVER['REMOTE_ADDR'] == $ipv6_dpedia ){

    $data_masuk = $_POST['content'];
    $json = json_decode($data_masuk,TRUE);
    $json['_ip'] = $_SERVER['REMOTE_ADDR'];
    file_put_contents('callback.txt', json_encode($json), FILE_APPEND);

    $oid        = $json['oid'];
    $service    = $json['service'];
    $price      = $json['price'];
    $status     = $json['status'];
    $date       = $json['date'];
    $catatan    = $json['catatan'];

    $sql        = "UPDATE pembelian_pulsa SET status = '$status' , keterangan = '$catatan' WHERE oid = '$oid' AND provider = 'DPEDIA'";

    $ok   = mysqli_query($conn,$sql);

    if ( $ok == TRUE){
        echo json_encode([
            "status"    => "ok"
            ]);

    }else{
        echo json_encode([
            "status"    => "fail"
            ]);
    }
} else {
    echo json_encode([
            "status"    => "!ok"
            ]);
}

if(isset($_POST['content'])) {
    $data = json_decode($_POST['content'], 1);
    $data['_ip'] = $_SERVER['REMOTE_ADDR'];
    file_put_contents('last_callback.json', json_encode($data));
    $data = null;
}