Stripe Billing Method not working Nginx 403

The stripe billing method form does not load. See attached image. Console shows a 403 on the js. Using Nginx namecheap hosing so not related to mod_security.

Server scanner doesn’t work. Running it gives the same 403 page. Not sure what I need to adjust to get things working. No issues present when testing on my local machine.

Any help would be much appreciated. Thanks.

Which site exactly respond with 403 code? Is that your site or Stripe’s site?