Internal Server Error - Stripe Payment Extension (pls. help)

Greeting everyone,
I have recently purchased the payment extension from Stripe and received a number of different files.

I have picked one of them (stripe-oc2.3.ocmod) which I think the correct one. The installation went well and the payment option is appearing in the payment extension/admin module. However, when I tried to execute this function through purchase it ended up with the message "internal server error". I have contacted Stripe separately and have a chat with their consultant. They confirmed nothing triggered from their end which means my installation was not well executed.

Now, I am reaching out to you hoping someone could help to solve this issue, please? Btw. I am using OpenCart ver 2.3.02

Many thanks, Dan

Contact the extension developer for support. It probably has a bug somewhere.