You are using stripe-php 7.12.0 the latest is 10.12.1

should be a straightforward upgrade...

https://github.com/stripe/stripe-php/releases/tag/v10.12.1

The stripe payment dialog seems to be the older one. Can you please update it to the payment element?

https://stripe.com/docs/payments/payment-element

Also would be great to have stripe link payment option.

Payments also need an option to charge surcharges for events on payments.

Ideally it should use stripe checkout with cart products pushed and gateway and admin fees.