This is a common payment method for Chinese people.
In fact, not only can I not use the payment options on digitalocean.com. Most of the introduction websites of China VPS tend to recommend VPS service providers who can use Alipay, such as https://doub.io/vps-tj/. Chinese people do not have the habit of using PayPal and other credit cards, most of which use Alipay, and Alipay is also the largest payment service provider in China.
If digitalocean.com adds Alipay option, digitalocean.com will bring a lot of income from China.
Https://intl.alipay.com/ is the official website of Alipay. We hope you understand and support this payment method.
Most of these sentences use Google Translate. My English is not very good, I'm sorry.