Access to XMLHttpRequest at 'https://checkout.sandbox.bka.sh/v1.2.0-beta/checkout/token/grant' from origin 'http://example.com' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
Did you run Chrome in CORS disabled mode? Go through this section here. The APIs are designed to be called from backend. Any web browser will throw CORS exception.
There is a throwback on page load.
Access to XMLHttpRequest at 'https://checkout.sandbox.bka.sh/v1.2.0-beta/checkout/token/grant' from origin 'http://example.com' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.