$tradeType = "APP";  // JSAPI
$accountPayment = [
    'APP' => [
        'app_id' => 'app_id',
        'mch_id' => 'mch_id',
        'key' => 'XXXXXXXXXXXXXXXXXXXXXXX',
        'cert_path' => app_path('resources/cert/apiclient_cert.pem'),
        'key_path' => app_path('resources/cert/apiclient_key.pem'),
        'notify_url' => route('weChatNotifyUrl'),
    ],
    'JSAPI' => [
        'app_id' => 'app_id',
        'mch_id' => 'mch_id',
        'key' => 'XXXXXXXXXXXXXXXXXXXXXXX',
        'cert_path' => app_path('resources/cert2/apiclient_cert.pem'),
        'key_path' => app_path('resources/cert2/apiclient_key.pem'),
        'notify_url' => route('weChatNotifyUrl'),
    ],
];
 
$app = Factory::payment($accountPayment[$tradeType]);
 
$order_info = [
    'body' => $title,
    'out_trade_no' => $order_number,
    'total_fee' => $amount,
    'trade_type' => $tradeType,   // 交易类型 JSAPI | NATIVE |APP | WAP
];
 
$result = $app->order->unify($order_info);
if ($tradeType == 'JSAPI') { // 微信内H5/小程序支付
    $jssdk = $app->jssdk;
    $config = $jssdk->bridgeConfig($result['prepay_id'], false);
} else { // APP支付
    $config = $app->jssdk->appConfig($result['prepay_id']);
}
微信内H5/小程序支付$config信息
 
"config": {
    "appId": "xxxxx",
    "timeStamp": "xxxxx",
    "nonceStr": "xxxxx",
    "package": "prepay_id=xxxxxx",
    "signType": "MD5",
    "paySign": "xxxxx"
}
APP支付$config信息
 
"config": {
    "appid": "xxxxx",
    "partnerid": "xxxxx",
    "prepayid": "xxxxxx",
    "noncestr": "xxxxx",
    "timestamp": 2022215515,
    "package": "Sign=WXPay",
    "sign": "xxxxxxxx"
}