- Legacy Customer Account forms now require a valid hCaptcha token; the /challenge endpoint is removed, and non‑compliant submissions return 400 errors.
- reCAPTCHA v3 is fully deprecated on Storefront forms; any request containing a recaptcha‑v3‑token or using window.grecaptcha will be rejected with a 400 error.
- Update custom code or themes to use hCaptcha as described in the developer docs.