Store is on 6.1.7 and has SSL enabled.
Enabled Invisible reCAPTCHA.
I am able to register new accounts, log in, and checkout as a logged in customer.
I am also able to create an account during checkout and proceed as normal.
However, trying to checkout as a guest, i.e. not creating a registered account, does not work.
Upon entering the customer data and clicking either `Update Basket` or `Secure Checkout`, the error message `The verification code was incorrect. Please tr