When I've been asking the Aliexpress Chat Support the question "How do I remove my Alipay account?" they use to answer that it is not possible.
In my last conversation with the support I was learned something different, I was told that the Alipay account in fact can be removed by simply removing the connected Aliexpress account.
Question: How do I remove my Alipay account?
Answer: Remove your Aliexpress account if you want to remove your Alipay account. You cannot remove your Alipay account alone.
When I've been asking the Aliexpress Chat Support the question "How do I remove my Alipay account?" they use to answer that it is not possible.
In my last conversation with the support I was learned something different, I was told that the Alipay account in fact can be removed by simply removing the connected Aliexpress account.
Please add this to https://helppage.aliexpress.com/buyercenter/index.htm under the link Payments -> My Alipay account