@royho – I too am having trouble using Stripe checkout with the lambda theme. I realize you can’t troubleshoot a third-party theme, so I won’t ask you to do that. Instead, I was wondering if you have general advice of how to troubleshoot a theme that doesn’t work with the plugin? For example, are there certain common points of failure, or input fields that need to be named a certain way? Any guidance you could offer would be helpful.