How to find find the Callback function 2Capthcha ?

[MJ3600]

Hello,
I still can't find the Callback function 2Capthcha
I read the previous posts but I don't get it ;/

can you show him on this page where to look for him? I don't see anything like that here ___grecaptcha_cfg.clients[0]
one thing i found was a ___grecaptcha_cfg.clients[d] but there is no callback function.

example page where you try to learn it below just click the login and the captcha pop up

mercadobitcoin.com.br/conta/login

I am asking for help in learning

 

[MJ3600]

I have comprehended other posts and are about to close

 

[Mark Miller]

however i have a problem i can't find callback