Follow these steps to purchase the Web Application Firewall service:
Log on to the official Alibaba Cloud website.
Click Web Application Firewall to access WAF page.
Click Buy Now to go to the Web Application Firewall purchase page.
Based on functions and product specifications provided by different versions, select a version that suits your business requirements.
Note: You can upgrade the Web application firewall version any time.
Select a package, click Buy Now in the lower right corner of the page, and complete the payment.