reCaptcha V2 loaded in Ajax

How to use ajax Recaptcha V2, with $ ajax method .getScript or in general? I need to load only if a step has been validated. Thank you in advance for your explanations. -- You received this message because you are subscribed to the Google Groups "reCAPTCHA" group. To unsubscribe from this group and stop receiving emails from it, send an email to recaptcha+unsubscribe@googlegroups.com. To post to this group, send email to recaptcha@googlegroups.com. Visit this group at http://bit.ly/1dkFnYd. For more options, visit http://bit.ly/P65DvS.