Virtual_account.php

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Virtual_account extends CI_Controller {

    public function __construct()
    {
        parent::__construct();
        $this->client_id = 'client_id';
        $this->secret_key = 'secret_key';
        $this->url = 'URL';
        $this->va = $this->load->database('va', true);
        $this->load->library('BniEnc');
        $this->load->helper('get_content');
        if( ! $this->ion_auth->logged_in() )
        {
            redirect('auth/login');
        }
    }

    private function transmit($data_asli)
    {
        $hashed_string = BniEnc::encrypt(
            $data_asli,
            $this->client_id,
            $this->secret_key
        );

        $data = array(
            'client_id' => $this->client_id,
            'data' => $hashed_string,
        );

        $response = get_content($this->url, json_encode($data));
        $response_json = json_decode($response, true);

        if ($response_json['status'] !== '000') {
            // handling jika gagal
            var_dump($response_json);
            exit;
            // return FALSE;
        }
        else {
            // $data_response = BniEnc::decrypt($response_json['data'], $this->client_id, $this->secret_key);
            // return array( 'status' => $response_json['status'], 'data_response' => $data_response );
            return TRUE;
        }
    }

    public function get_va( $id_invoice = null )
    {
        if( $id_invoice )
        {
            $this->load->helper('get_content');
            include_once __DIR__ . "/../../../../libraries/BniEnc.php";

            $data_asli = array(
                'type' => 'inquirybilling',
                'client_id' => $this->client_id,
                'trx_id' => $this->db->get_where('invoice', array('id_invoice' => $id_invoice))->row()->trx_id,
            );

            $this->transmit( $data_asli );
        }
        else
        {
            show_404();
        }
    }
}