微信支付

$client = new Client('mch_id', 'api_secret');
$client->setSignature('MD5');
$options = [];
//使用证书
$options['cert'] = "your cert";
$options['ssl_key'] = "your cert key";
$request = WeChatPay::rpcRequest($client, $options);
$response = $request->scheme('https')
    ->host('api.mch.weixin.qq.com')
    ->path('/mmpaymkttransfers/sendredpack')
    ->method('POST')
    ->inputFormat('xml')
    ->outputFormat('xml')
    ->options(array_merge([
        'query' => [
            // query params
        ],
    ],$options))->request()->toArray();