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<?php
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class GBPrimePay
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{
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    private string $url;
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    private string $token;
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    private string $public_key;
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    private string $secret_key;
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    private bool $isToken = true;
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    /**
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     * Documents
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     * https://doc.gbprimepay.com/
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     * @param env
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     */
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    public function __construct(string $env = 'production')
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    {
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        if ($env == 'production') {
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            $this->url = 'https://api.gbprimepay.com';
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        } else {
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            $this->url = 'https://api.globalprimepay.com';
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        }
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    }
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    public function parse_data(array $data)
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    {
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        $fields = '';
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        $index = 0;
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        foreach ($data as $key => $value) {
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            $index += 1;
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            $fields .= $key . '=' . urlencode($value);
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            if ($index != count($data)) {
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                $fields .= '&';
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            }
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        }
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        if ($this->isToken) {
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            $fields .= '&token=' . urlencode($this->token);
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        } else {
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            $fields .= '&publicKey=' . $this->public_key;
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            $concatstring = $data['amount'] . $data['referenceNo'] . $data['responseUrl'] . $data['backgroundUrl'];
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            $checksum = hash_hmac('sha256', $concatstring, $this->secret_key, false);
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            $fields .= '&checksum=' . $checksum;
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        }
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        return $fields;
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    }
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    public function request(string $path, array $data)
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    {
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        $fields = $this->parse_data($data);
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        $curl = curl_init();
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        curl_setopt_array($curl, array(
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            CURLOPT_URL => $this->url . '' . $path,
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            CURLOPT_RETURNTRANSFER => true,
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            CURLOPT_ENCODING => '',
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            CURLOPT_MAXREDIRS => 10,
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            CURLOPT_TIMEOUT => 0,
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            CURLOPT_FOLLOWLOCATION => true,
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            CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
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            CURLOPT_CUSTOMREQUEST => 'POST',
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            CURLOPT_POSTFIELDS => $fields,
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            CURLOPT_HTTPHEADER => array(
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                'Content-Type: application/x-www-form-urlencoded'
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            ),
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        ));
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        $response = curl_exec($curl);
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        curl_close($curl);
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        return $response;
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    }
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    /**
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     * Documents
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     * https://doc.gbprimepay.com/qrcash
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     * @param mode qrcode or text
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     */
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    public function promptpay(array $data, string $token, string $mode = 'qrcode')
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    {
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        $this->isToken = true;
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        $this->token = $token;
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        if ($mode == 'qrcode') {
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            $path = '/v3/qrcode';
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        } else {
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            $path = '/v3/qrcode/text';
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        }
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        $response = $this->request($path, $data);
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        if ($mode == 'qrcode') {
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            return 'data:image/png;base64,' . base64_encode($response);
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        } else {
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            return $response;
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        }
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    }
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    /**
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     * Documents
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     * https://doc.gbprimepay.com/truewallet
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     */
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    public function truewallet(array $data, string $public_key, string $secret_key)
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    {
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        $this->isToken = false;
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        $this->public_key = $public_key;
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        $this->secret_key = $secret_key;
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        $response = $this->request('/v2/trueWallet', $data);
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        return $response;
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    }
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    /**
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     * Documents
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     * https://doc.gbprimepay.com/linepay
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     */
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    public function linepay(array $data, string $public_key, string $secret_key)
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    {
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        $this->isToken = false;
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        $this->public_key = $public_key;
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        $this->secret_key = $secret_key;
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        $response = $this->request('/v2/linepay', $data);
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        return $response;
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    }
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    /**
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     * Documents
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     * https://doc.gbprimepay.com/shopeepay
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     */
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    public function shopeepay(array $data, string $public_key, string $secret_key)
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    {
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        $this->isToken = false;
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        $this->public_key = $public_key;
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        $this->secret_key = $secret_key;
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        $response = $this->request('/v1/shopeePay', $data);
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        return $response;
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    }
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}

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<?php
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// ถ้าเป็น ip ของ GBPrimePay ถึงจะให้ทำงานโค้ดใน if
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 $white_list = [
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    '203.151.205.45',
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    '203.151.205.33',
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    '18.143.213.62',
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    '13.215.225.183',
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    '54.254.171.101',
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    '18.141.54.201',
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    '54.151.232.117',
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    '54.255.79.153'
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];
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if (in_array($_SERVER['REMOTE_ADDR'], $white_list)) {
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    $respFile = fopen("resp-log.json", "w") or die("Unable to open file!");
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    $json_str = file_get_contents('php://input');
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    fwrite($respFile, $json_str . "nn");
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    $json_obj = json_decode($json_str);
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    // $result = $db->query("SELECT user_id FROM topup WHERE refcode = '{$json_obj->referenceNo}'");
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    // $db->query("UPDATE users SET point = point + {$json_obj->amount} WHERE id = {$result->user_id}");
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    fwrite($respFile, $json_obj);
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    fclose($respFile);
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} else {
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    die('Access Denied');
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}

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<?php
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require_once 'gbprimepay.php';
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$token = "TOKEN";
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// $public_key = "PUBLIC_KEY";
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// $secret_key = "SECRET_KEY";
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$gbprimepay = new GBPrimePay();
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$qrcode = $gbprimepay->promptpay([
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    'amount' => '10.00',
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    'referenceNo' => 'PP1234',
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    'backgroundUrl' => 'https://dev.0x01code.me/gbprimepay.webhook.php',
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], $token);
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echo '<img src="' . $qrcode . '">';
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// echo $gbprimepay->truewallet([
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//     'amount' => '10.00',
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//     'referenceNo' => 'TW1234',
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//     'backgroundUrl' => 'https://dev.0x01code.me/gbprimepay.webhook.php',
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//     'responseUrl' => 'https://dev.0x01code.me/thankyou.php',
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//     'customerTelephone' => '0600000000',
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// ], $public_key, $secret_key);
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// echo $gbprimepay->linepay([
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//     'amount' => '10.00',
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//     'referenceNo' => 'LP1234',
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//     'detail' => 'test',
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//     'responseUrl' => 'https://dev.0x01code.me/thankyou.php',
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//     'backgroundUrl' => 'https://dev.0x01code.me/gbprimepay.webhook.php',
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// ], $public_key, $secret_key);
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// echo $gbprimepay->shopeepay([
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//     'amount' => '10.00',
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//     'referenceNo' => 'SP1234',
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//     'responseUrl' => 'https://dev.0x01code.me/thankyou.php',
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//     'backgroundUrl' => 'https://dev.0x01code.me/gbprimepay.webhook.php',
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// ], $public_key, $secret_key);

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$gbprimepay = new GBPrimePay();
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$qrcode = $gbprimepay->promptpay([
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    'amount' => '10.00',
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    'referenceNo' => 'PP1234',
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    'backgroundUrl' => 'https://dev.0x01code.me/gbprimepay.webhook.php',
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], $token, 'text');
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echo $qrcode;

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$gbprimepay = new GBPrimePay();
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$qrcode = $gbprimepay->promptpay([
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    'amount' => '10.00',
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    'referenceNo' => 'PP1234',
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    'backgroundUrl' => 'https://dev.0x01code.me/gbprimepay.webhook.php',
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], $token, 'text');
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echo $qrcode;