Hello,
Actually, when we inspected the site URL, we cannot find the publishable key value in frontend(checkout page) which you have added for stripe checkout payment gateway in backend section. It seems that the ‘Test Mode’ is enabled so please once check the ‘Test Mode’ option and disable it (if it is enabled) by going to Admin Panel > WP Travel > Settings > Debug as shown in screenshot below:
http://prntscr.com/q9phwi
Also, if the ‘Test Mode’ is disabled and the issue still persist then please provide us with admin login detail in below given email so that we can inspect the issue properly.
email: support@wptravel.io
Thank you.