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Edit File: CI_binance_pay.php

<?php
/*require_once "binance-api/Binance_pay.php";

class CI_binance_pay extends Binance_pay
{
	public function __construct() {
		parent::__construct();
	}
}

class CI_binance_pay
{
    private $api_key;
    private $secret_key;
    private $timestamp;
    private $nonce;
    private $return_url;
    private $cancel_url;

public function __construct()
    {
        $this->api_key = $this->api_key();
        $this->secret_key = $this->secret_key();
        $this->timestamp = $this->timestamp();
        $this->nonce = $this->nonce();
        $this->return_url = $this->return_url();
        $this->cancel_url = $this->cancel_url();
    }

public function create_order($merchant_trade_no, $amount, $currency) {
        // Request body
        $request = [
            'env' => [
                'terminalType' => 'WEB',
            ],
            'merchantTradeNo' => $merchant_trade_no,
            'orderAmount' => $amount,
            'currency' => $currency,
            'returnUrl' => $this->return_url . '&mtno=' . base64_encode($merchant_trade_no),
            'cancelUrl' => $this->cancel_url . '&mtno=' . base64_encode($merchant_trade_no),
            'goods' => [
                'goodsType' => '01',
                'goodsCategory' => 'D000',
                'referenceGoodsId' => '7876763A3B',
                'goodsName' => 'Ice Cream',
                'goodsDetail' => 'Greentea ice cream cone',
            ]
        ];

$json_request = json_encode($request);
        $payload = $this->timestamp."\n".$this->nonce."\n".$json_request."\n";
        $signature = strtoupper(hash_hmac('SHA512', $payload, $this->secret_key));

$headers[] = "Content-Type: application/json";
        $headers[] = "BinancePay-Timestamp: " . $this->timestamp;
        $headers[] = "BinancePay-Nonce: " . $this->nonce;
        $headers[] = "BinancePay-Certificate-SN: " . $this->api_key;
        $headers[] = "BinancePay-Signature: $signature";

$ch = curl_init();
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        curl_setopt($ch, CURLOPT_URL, "https://bpay.binanceapi.com/binancepay/openapi/v2/order");
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $json_request);

$result = curl_exec($ch);
        if (curl_errno($ch)) { echo 'Error:' . curl_error($ch); }
        curl_close ($ch);

$result = json_decode($result, true);
        return $result;
    }

public function query_order($merchant_trade_no) {

// Request body
        $request = [
            'merchantTradeNo' => base64_decode($merchant_trade_no)
        ];

$ch = curl_init();
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        curl_setopt($ch, CURLOPT_URL, "https://bpay.binanceapi.com/binancepay/openapi/v2/order/query");
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $json_request);

$result = curl_exec($ch);
        if (curl_errno($ch)) { echo 'Error:' . curl_error($ch); }
        curl_close ($ch);

$result = json_decode($result, true);
        return $result;
    }

private function timestamp() {
        return round(microtime(true) * 1000);
    }

private function nonce() {
        $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
        $nonce_str = '';
        for($i=1; $i <= 32; $i++)
        {
            $pos = mt_rand(0, strlen($chars) - 1);
            $char = $chars[$pos];
            $nonce_str .= $char;
        }
        return $nonce_str;
    }

private function dump($data) {
        echo '<pre>';print_r($data);die;
    }

private function debug() {
        echo time();die;
    }

private function api_key() {
        return 'vqce6hfvd6n3tsy1c7hnj95xsrl9fn4tz6sxupavnysjwgn3xuuehbsmthfsraml';
    }

private function secret_key() {
        return 'zcetv5mjuq7amumqoga8xnqxfdtqsixirhfpcxoggydbif6u2vnzjrsr2u1naxek';
    }

private function return_url() {
        return 'https://codeunlocksource.com/binance-pay-api/callback.php?event=return';
    }

private function cancel_url() {
        return 'https://codeunlocksource.com/binance-pay-api/callback.php?event=cancel';
    }
}