New Stripe Checkout 500 error

Hi I followed the instructions outlined by Tuan here:
www.joomdonation.com/forum/events-bookin...-payment.html#127339
I have valid sk_live_ and pk_live_ api keys
I have added a webhook instripe
URL:
athloneec.ontargetdev.eu/index.php?optio...od=os_stripecheckout
Event types:
checkout.session.completed

I added the Signing Secret

when I go to make payment I get redirected to:
athloneec.ontargetdev.eu/cpd-courses/sum...ividual_registration

with Error message
This page isn’t working athloneec.ontargetdev.eu is currently unable to handle this request.
HTTP ERROR 500

Can you confirm if the new stripe checkout is working?

Hello

Yes, it's working and have been using by other customers

In your case, maybe there is some conflict. Please submit a support ticket sending us:

- Super admin account of the site
- Link to the page which we can register for the event

We are going to check to see what's wrong and get it sorted

Also, you need to disable os_stripe payment plugin to use os_stripecheckout payment plugin (to avoid conflict)

Tuan