<?php
\$key = '您的通讯密钥'; // 同易支付密钥
\$param = array(
    "payId"     => 'ORDER'.time(),     //商户订单号
    "param"     => 'vip123',           //透传参数
    "type"      => 1,                  //1微信 2支付宝 3QQ 4数字人民币 5USDT
    "price"     => '1.00',             //金额
    "notifyUrl" => 'http://商户/notify.php',
    "returnUrl" => 'http://商户/return.php',
);
//固定顺序签名（注意与易支付字典序不同）
\$param["sign"] = md5(\$param["payId"].\$param["param"].\$param["type"].\$param["price"].\$key);
\$query = http_build_query(\$param);
\$resp = file_get_contents("http://域名/createOrder?{\$query}");
\$data = json_decode(\$resp, true);
if (\$data["code"] === 1) {
    //用 \$data["data"]["payUrl"] 渲染收款码
}
?>

<?php
\$app_id = '1000';          //商户ID
\$key     = '您的通讯密钥';   //同易支付密钥
\$param = array(
    "app_id"         => \$app_id,
    "trade_order_id" => 'XH'.time(),   //商户订单号
    "total_fee"      => '1.00',        //金额
    "order_type"     => 'WECHAT',      //WECHAT微信 ALIPAY支付宝
    "title"          => 'VIP会员',      //商品名称
    "notify_url"     => 'http://商户/notify.php',
    "return_url"     => 'http://商户/return.php',
    "attach"         => 'vip123',      //透传
    "nonce_str"      => mt_rand(100000,999999),
);
ksort(\$param); //按 key ASCII 升序
\$sign = '';
foreach (\$param as \$k => \$v) {
    if (\$v === '' || \$k == 'hash') continue;
    \$sign .= (\$sign == '' ? '' : '&') . \$k . '=' . \$v;
}
\$param['hash'] = md5(\$sign . \$key);
//标准支付：表单提交到 /payment/do.html 后跳转收银台
\$query = http_build_query(\$param);
header("location:http://域名/payment/do.html?{\$query}");
//直接支付：POST 到 /payment/easypay.html，取返回 JSON 的 url/qr 渲染收款码
?>

<?php
\$id  = '1000';            //商户ID
\$key = '您的通讯密钥';      //同易支付密钥
\$param = array(
    "id"         => \$id,
    "pay_id"     => 'CP'.time(),  //商户订单号
    "type"       => 3,            //1支付宝 2QQ 3微信
    "price"      => '1.00',       //金额
    "param"      => 'vip123',     //透传
    "notify_url" => 'http://商户/notify.php',
    "return_url" => 'http://商户/return.php',
);
ksort(\$param); //按 key ASCII 升序
\$sign = '';
foreach (\$param as \$k => \$v) {
    if (\$v === '' || \$k == 'sign' || \$k == 'sign_type') continue;
    \$sign .= (\$sign == '' ? '' : '&') . \$k . '=' . \$v;
}
\$param['sign'] = md5(\$sign . \$key);
\$param['sign_type'] = 'MD5';
\$query = http_build_query(\$param);
header("location:http://域名/creat_order/?{\$query}"); //跳转收银台
?>

<?php
\$pid = '1000';                          //商户ID
\$appPrivKey = '平台公示的应用私钥（裸base64，去PEM头尾）'; //后台支付配置页复制
\$param = array(
    "pid"          => \$pid,
    "type"         => 'wxpay',
    "out_trade_no" => 'V2'.time(),
    "notify_url"   => 'http://商户/notify.php',
    "return_url"   => 'http://商户/return.php',
    "name"         => 'VIP会员',
    "money"        => '1.00',
    "timestamp"    => time().'',
);
//1. 参数按 key ASCII 升序拼 a=1&b=2…（滤空值与 sign/sign_type）
ksort(\$param);
\$signStr = '';
foreach (\$param as \$k => \$v) {
    if (\$v === '' || \$k == 'sign' || \$k == 'sign_type') continue;
    \$signStr .= (\$signStr == '' ? '' : '&') . \$k . '=' . \$v;
}
//2. 应用私钥 RSA2 签名（base64，官方SDK为SHA256withRSA）
\$pem = "-----BEGIN PRIVATE KEY-----\n" . wordwrap(\$appPrivKey, 64, "\n", true) . "\n-----END PRIVATE KEY-----";
openssl_sign(\$signStr, \$signature, \$pem, OPENSSL_ALGO_SHA256);
\$param['sign'] = base64_encode(\$signature);
\$param['sign_type'] = 'RSA2';
//3. 表单方式提交下单（官方协议提交格式 application/x-www-form-urlencoded）
\$ch = curl_init('http://域名/api/pay/create');
curl_setopt_array(\$ch, [CURLOPT_POST => true,
    CURLOPT_POSTFIELDS => http_build_query(\$param),
    CURLOPT_RETURNTRANSFER => true]);
\$data = json_decode(curl_exec(\$ch), true);
if (\$data['code'] === 0) {
    //\$data['pay_info'] 为支付跳转地址
    //\$data['sign'] 用「平台公钥」+ openssl_verify(响应字典序串（滤sign/sign_type）, base64_decode(\$data['sign']), \$platPubKey, OPENSSL_ALGO_SHA256) 验签
}
?>