Whilst the URL may be valid, when you save the settings a payment method EE does a request to your server confirm the URL works, if that fails for whatever reason you get the above notice.
So it could be something on the server is blocking the request or something server side not configured correctly.
Are you running any security plugins on the site?
I tried to view the site to see if I can spot any problems but the site linked to your license is running EE3, the above error is from EE4.
The support post ‘Broken payment button URL’ is closed to new replies.
Have a question about this support post? Create a new support post in our support forums and include a link to this existing support post so we can help you.
Support forum for Event Espresso 3 and Event Espresso 4.