Alipay is China's #1 merchant processor and is supported by Restrict Content Pro through  Stripe Checkout.

To enable Alipay payment processing, first enable Stripe Checkout, as shown in the Stripe Checkout documentation. Once Stripe Checkout is enabled, Alipay support can be enabled checking the Enable Alipay Support box in Restrict > Settings > Payments.

Once enabled, the Stripe Checkout modal will display an option to pay with an Alipay account: