The callback to render
The index position in the step's callback array
A function to call when the callback value is changed
Returns true if a successful reCAPTCHA result has been captured.
Instructs reCAPTCHA to render its UI.
Creates all required DOM elements and returns the containing element.
Invokes the reCAPTCHA API, which should be added to the page as an external script with explicit rendering enabled. Refer to the reCAPTCHA documentation for more information.