Few main things could cause this issue.

1. Disable your AD-BLOCKER for your local domain(http://localhost:8080/). Advance Adblockers are blocking tracking events.such as GTM tags and etc. ADBLOCKER identify stripe as a tracker and blocks it because stripe tracks the user for security purposes.
2. Make sure in your FE(Frontend) side local config you have setup the stripe keys.
3. Make sure your BE(Backend) is listening to correct testing environment. if you are using dot net make sure your user secrets are same as listener.