Thank you for your patience
We have investigated carefully your test page and it appears that the error you are receiving is referred to the expiration of your own token, that you are using for the plugin setup. Please try to follow the plugin documentation and refresh your token keys, and replace the old ones that your plugin currently uses. It should help.
Argumentation - the error appears right after the page load when you run the app as the harry.flash1@simpbills.net user. If you logout and try to log as some user - you’ll receive the error.
Additional advice - please try also (after you refresh your token) recreate on some test page our demo page functionality and check if it’s working OK.
I hope it helps. Take care.