I have a form I'm creating programmatically with a custom module, and I need to add the Google recaptcha to it. In the Google reCaptcha module's settings page (/admin/config/spam_protection/google_recaptcha/forms) I only see the login, register and comments forms and no way to add a custom form (like in the captcha module).
I googled as well as looked in the Google Captcha module's files and API file and can't find any hooks or info on how I can add the captcha element to a custom form. Any pointers would be appreciated!