Web connection problem in China
In China, it is OK to connect to your website, but not possible to buy any software. And if I use vpn to connect, then there will not be Alipay options. (I try and finally manage to pay by some tricky) The web blocking of China is not your fault, but you can try to fix it. Check if you use any link that got block in China (like Google) ou your purchase site please.
Besides, I advise you to set up a website in China (like what matlab does) or collaberate with some Chinese company too. I really like your softwares, thanks.