Button links to broken website

When you push the button, I’m taken to the following URL:
http://www.buyhimabeer.com/buy?name=me&email=%5Bemail removed]

It’s a Square Space landing page with the following error:

Website Expired
This account has expired. If you are the site owner, click below to login.

https://ww.wp.xz.cn/plugins/buy-him-a-beer/