[
    'response_type' => 'collection',//collection array json object
    'log' => [
        'file' => __DIR__ . '/logs/kaylu-alipay.log',
        'level' => 'debug',
    ],
    'http' => [
        'timeout' => 30,
    ],
    //当面付
    'f2fpay' => [
        //签名方式,默认为RSA2(RSA2048)
        'sign_type' => "RSA2",

        //支付宝公钥
        'alipay_public_key' => "",

        //商户私钥
        'merchant_private_key' => "",

        //编码格式
        'charset' => "UTF-8",

        //支付宝网关
        'gateway_url' => "https://openapi.alipaydev.com/gateway.do",

        //应用ID
        'app_id' => "",

        //异步通知地址,只有扫码支付预下单可用
        'notify_url' => "http://www.baidu.com",
    ]
]

    // laravel >= 5.5
    Kaylyu\Alipay\F2fpay\ServiceProvider::class
    
    // lumen
    $app->register(Kaylyu\Alipay\F2fpay\ServiceProvider::class);

    //统一收单线下交易预创建（扫码支付）
    app('kaylu.alipay.f2fpay')->order->qrPay