Callback Winpay

public function index()
    {
        $json_string = file_get_contents('php://input');
        $json_array  = json_decode($json_string, true);
        $publicKey   = '-----BEGIN PUBLIC KEY-----
MIGeMA0GCSqGSIb3DQEBAQUAA4GMADCBiAKBgHGK10J1oBbCD75Wy8P5rL8zzCz9
lpHZ7OIHVaO4vlX0tjpKD887ldaTLl4Vdhc6I88OHscV/ijQ7OQ07IpWLAoSm7VK
puiUDt9xUx9dCHAIrH6DDNOI95z2b6jxwh81ZTC+LCDsEb5b797dmxa7Kv8kABjo
Nt8JR33E9p3d7uzrAgMBAAE=
-----END PUBLIC KEY-----';

        $path            = '/v1.0/transfer-va/payment';
        $timestamp       = isset($_SERVER['HTTP_X_TIMESTAMP']) ? $_SERVER['HTTP_X_TIMESTAMP'] : '';
        $signature       = isset($_SERVER['HTTP_X_SIGNATURE']) ? $_SERVER['HTTP_X_SIGNATURE'] : '';
        $httpMethod      = 'POST';
        $partnerId       = isset($_SERVER['HTTP_X_PARTNER_ID']) ? $_SERVER['HTTP_X_PARTNER_ID'] : '';
        $body            = $json_array;
        $hashedBody      = strtolower(bin2hex(hash('sha256', json_encode($body, JSON_UNESCAPED_SLASHES), true)));
        $stringToSignArr = [$httpMethod, $path, $hashedBody, $timestamp];
        $stringToSign    = implode(':', $stringToSignArr);

        try {
            $publicKey = openssl_get_publickey($publicKey);
            $verify    = openssl_verify($stringToSign, base64_decode($signature), $publicKey, OPENSSL_ALGO_SHA256);
            if ($verify !== 1) {
                $response = [
                    'responseCode'    => '4012700',
                    'responseMessage' => 'Cannot verify signature',
                ];
            } else {
                // Update Payment
                $virtualAccountNo = $json_array["virtualAccountNo"];
                $trxId            = $json_array["trxId"];
                $total            = $json_array["paidAmount"]["value"];
                $channel          = $json_array["additionalInfo"]["channel"];

                // Update Status
                $dataCallback = array(
                    'callback_api_nomor'  => $trxId,
                    'callback_api_code'   => $channel,
                    'callback_api_total'  => $total,
                    'callback_api_update' => date('Y-m-d H:i:s'),
                );

                $this->db->insert('sid_callback_api', $dataCallback);

                // UpdateInvoice
                $checkData = $this->db->get_where('v_invoice', array('invoice_nomor' => trim($trxId)));
                $num_rows  = $checkData->num_rows();
                if ($num_rows > 0) {
                    $dtInvoice        = $checkData->row();
                    $invoice_id       = $dtInvoice->invoice_id;
                    $pelanggan_id     = $dtInvoice->pelanggan_id;
                    $invoice_total    = $dtInvoice->invoice_total;
                    $invoice_subtotal = $dtInvoice->invoice_subtotal;
                    $invoice_status   = $dtInvoice->invoice_status;
                    $user_reseller    = $dtInvoice->user_reseller;
                    if ($invoice_status == 'U') {
                        if ($total == $invoice_total) {
                            // Cek Komisi
                            if ($user_reseller != '') {
                                $dataReseller = $this->db->get_where('sid_users', array('user_username' => $user_reseller))->row();
                                $komisi       = $dataReseller->user_komisi;
                                $komisi_rp    = round(($komisi * $invoice_subtotal) / 100);
                                $netto        = ($invoice_subtotal - $komisi_rp);

                                // Insert ke Tabel Komisi
                                $dataKomReseller = array(
                                    'invoice_id'    => $invoice_id,
                                    'user_username' => $user_reseller,
                                    'komisi_total'  => $komisi_rp,
                                    'komisi_update' => date('Y-m-d H:i:s'),
                                );

                                $this->db->insert('sid_komisi', $dataKomReseller);
                            } else {
                                $komisi_rp = 0;
                                $netto     = $invoice_subtotal;
                            }

                            $dataJenisBayar = $this->db->get_where('sid_jenis_bayar', array('jenis_bayar_code' => $channel))->row();
                            $jenis_bayar_id = $dataJenisBayar->jenis_bayar_id;
                            // Update Bayar Invoice
                            $dataUpdate = array(
                                'jenis_bayar_id'    => $jenis_bayar_id,
                                'invoice_status'    => 'P',
                                'invoice_id_bayar'  => $id_transaksi,
                                'invoice_komisi'    => $komisi_rp,
                                'invoice_netto'     => $netto,
                                'invoice_dibayar'   => $invoice_total,
                                'invoice_sisa'      => 0,
                                'invoice_tgl_bayar' => date('Y-m-d H:i:s'),
                                'invoice_update'    => date('Y-m-d H:i:s'),
                            );

                            $this->db->where('invoice_id', $invoice_id);
                            $this->db->update('sid_invoice', $dataUpdate);

                            // Insert Notifikasi Teknisi
                            $dataPelanggan  = $this->db->get_where('v_invoice', array('invoice_id' => $invoice_id))->row();
                            $dataNotifikasi = array(
                                'user_username'         => 'admin',
                                'notifikasi_level'      => 'Teknisi',
                                'notifikasi_tanggal'    => date('Y-m-d H:i:s'),
                                'notifikasi_keterangan' => 'Pembayaran Invoice : ' . $dataPelanggan->pelanggan_nama . ', ID Pel. : ' . $dataPelanggan->pelanggan_nomor . '. Siap Pasang.',
                                'notifikasi_update'     => date('Y-m-d H:i:s'),
                            );

                            $this->db->insert('sid_notifikasi', $dataNotifikasi);
                            // Insert Notifikasi Finance
                            $dataFinance = array(
                                'user_username'         => 'admin',
                                'notifikasi_level'      => 'Finance',
                                'notifikasi_tanggal'    => date('Y-m-d H:i:s'),
                                'notifikasi_keterangan' => 'Pembayaran Invoice : ' . $dataPelanggan->pelanggan_nama . ', ID Pel. : ' . $dataPelanggan->pelanggan_nomor . '. Siap Pasang.',
                                'notifikasi_update'     => date('Y-m-d H:i:s'),
                            );

                            $this->db->insert('sid_notifikasi', $dataFinance);

                            // Kirim BOT Telegram
                            $message = $this->pesan_bot($invoice_id);
                            $this->kirimbot($message);

                            // Sukses
                            $response = [
                                'responseCode'    => '2002500',
                                'responseMessage' => 'Successful',
                            ];
                        } else {
                            // Beda Total
                            $response = [
                                'responseCode'    => '4042513',
                                'responseMessage' => 'Invalid Amount',
                            ];
                        }
                    } else {
                        // Pembayaran Dobel
                        $response = [
                            'responseCode'    => '4092500',
                            'responseMessage' => 'Duplicate paymentRequestId',
                        ];
                    }
                } else {
                    $response = [
                        'responseCode'    => '4042501',
                        'responseMessage' => 'Transaction Not Found',
                    ];
                }
            }
        } catch (Exception $e) {
            $response = [
                'responseCode'    => '4012700',
                'responseMessage' => 'Invalid signature {' . $e->getMessage() . '}',
            ];
        }

        echo json_encode($response);
    }