There are two paGO security plugins available, and it is best practice to configure and use both.
reCAPTCHA is used when a customer creates a new account during the checkout process. You should select your reCAPTCHA version, site and secret keys. Also set your desired theme.
Akismet/Project Honey Pot
Honey Pot is used for product comments to help alleviate bot comments. Just enter your Akismet API key and publish.