[2018-12-13 09:33:29] local.ERROR: Undefined index: sign {"exception":"[object] (ErrorException(code: 0): Undefined index: sign at E:\laravelShop\laravelShop\vendor\yansongda\pay\src\Gateways\Alipay\Support.php:229)
[stacktrace]

0 E:\laravelShop\laravelShop\vendor\yansongda\pay\src\Gateways\Alipay\Support.php(229): Illuminate\Foundation\Bootstrap\HandleExceptions->handleError(8, 'Undefined index...', 'E:\\laravelShop\\...', 229, Array)

1 E:\laravelShop\laravelShop\vendor\yansongda\pay\src\Gateways\Alipay.php(160): Yansongda\Pay\Gateways\Alipay\Support::verifySign(Array)

2 E:\laravelShop\laravelShop\app\Http\Controllers\PaymentController.php(52): Yansongda\Pay\Gateways\Alipay->verify()

这是报错的一部分，
这是执行的终端命令，