update: alipay2f2 custom product name

app/Payments/AlipayF2F.php

@@ -47,7 +47,7 @@ class AlipayF2F {
             $gateway->setAlipayPublicKey($this->config['public_key']); // 可以是路径，也可以是密钥内容
             $gateway->setNotifyUrl($order['notify_url']);
             $gateway->setBizContent([
-                'subject' => $this->config['自定义商品名称'] ?? (config('v2board.app_name', 'V2Board') . ' - 订阅'),
+                'subject' => $this->config['product_name'] ?? (config('v2board.app_name', 'V2Board') . ' - 订阅'),
                 'out_trade_no' => $order['trade_no'],
                 'total_amount' => $order['total_amount'] / 100
             ]);