"An internal error has occurred." happened many times

I am really new here, so if something I did wrong, please let me know.

Linked a paid API, “An internal error has occurred.” happened many times, which cost me 15+ USD.

What happened and how can I get my money back?

And if any information is needed, please let me know.

Hi

To help us debug further, it would be helpful if you could share a screencast of the issue ?

If possible the input prompt which cause this error ?