1. The product you purchased does not support Alipay payment.

You chose the wrong country, and the country should be China. At present, only China people can pay with Alipay.

3. The default currency you selected is incorrect. You can't select RMB here, but you must select USD (transaction). Most people think that choosing "RMB" will show Alipay, but in fact it is just the opposite. Only by selecting "USD" can Alipay be displayed.