If you are getting the error "Invalid domain for site key" also seen below, then follow the steps below to create a new captcha key with your correct domain.
The begin, you will need to create a reCAPTCHA account. Go to https://www.google.com/recaptcha/intro/index.html. Click Get reCAPTCHA at the top right.
If you don't have any sites registered yet to use the reCAPTCHA API, you will need to register a new site.
Fill out the Label, choose the type of reCAPTCHA, enter your Domains, accept the reCAPTCHA Terms of Service then click Register.
Expand Keys in the Adding reCAPTCHA to your site section. You will need both the Site key and Secret key for your admin area.
In your admin area, go to Settings > Advanced Settings > Store Settings and expand how Captcha Settings. In the reCAPTCHA Public Key field, enter your Site key from reCAPTCHA. In the reCAPTCHA Private Key, enter the Secret key from the step above. Click Save.
This will automatically add CAPTCHAs to the default forms of your site, like the Register page.
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If you didn't get your question answered, please contact the Pinnacle Cart Support Team. To submit a ticket, go to the My Account drop-down menu at the top right of the admin area and select Support