php银联支付接口文档

<?php
// 银联支付接口配置
$merchantId = 'your_merchant_id';
$merKey = 'your_merchant_key';
$notifyUrl = 'http://yourdomain.com/notify.php';

// 构建支付请求参数
$params = [
    'version' => '1.0',
    'encoding' => 'utf-8',
    'certId' => 'your_cert_id',
    'bizType' => '000201',
    'accessType' => '0',
    'merId' => $merchantId,
    'orderId' => date('YmdHis') . mt_rand(1000, 9999),
    'txnTime' => date('YmdHis'),
    'txnAmt' => '1',
    'currencyCode' => '156',
    'frontUrl' => 'http://yourdomain.com/front.php',
    'backUrl' => $notifyUrl,
    'payMode' => '01',
    'transType' => '01',
    'merOrderDesc' => 'Test Payment'
];

// 签名
$sign = sign($params, $merKey);
$params['signature'] = $sign;

// 发送支付请求
$response = sendRequest('https://yourunionpayurl.com/api', $params);

if ($response['respCode'] == '00') {
    echo '支付请求成功';
} else {
    echo '支付请求失败';
}

function sign($params, $merKey) {
    ksort($params);
    $str = '';
    foreach ($params as $k => $v) {
        $str .= '&' . $k . '=' . $v;
    }
    $str = substr($str, 1) . '&key=' . $merKey;
    return md5($str);
}

function sendRequest($url, $data) {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data));
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    $response = curl_exec($ch);
    curl_close($ch);
    return json_decode($response, true);
}
?>