it can't recognize invisible recaptcha v2

[rvillalbadev]

Hello first of all,
what an incredible job!

On the other hand I had a problem trying to pass an invisible reCaptcha v2 on a web site, this site seems to have no BFRAME,

So i got the lethal:
""Could not find reCAPTCHA iframe""

however, I could manage to get the challenge:
i found the:

<div class="fld">
<input type="hidden" id="reCAPTCHA_site_key" name="reCAPTCHA_site_key" value="6LfBEb8UAAAAAC3Tj2jbBeAapky_TfX......">
<input type="hidden" id="action" name="action" value="acOfferAppointment">
</div>

And too i can see the:
<div class="grecaptcha-logo"><iframe title="reCAPTCHA"
However, my problem is that when reading the code that you have left here on github, it is not clear to me what action the script takes to try to favor the execution of the invisible recaptcha?

Could you please help me?