This is how you can pass on AJAX .js
var userdata = {
'action' : 'signin_member',
'username' : jQuery('#user_name').val(),
'password' : jQuery('#password').val(),
'hiddenurl': jQuery('#hiddenurl').val(),
'captcha' : grecaptcha.getResponse(0)
};
This is how you can handle the captcha ajax response
/*Validate Coupon Codes*/
add_action( 'wp_ajax_validate_scratchcode', 'validate_scratchcode_callback' );
add_action( 'wp_ajax_nopriv_validate_scratchcode', 'validate_scratchcode_callback' );
function validate_scratchcode_callback(){
$secret = "6LfYNNIZAAAAAA_eGXqymAFPe8yxQV5TITMUykhs";
$response = $_POST["captcha"];
$verify = file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret={$secret}&response={$response}");
$captcha_success=json_decode($verify);
if($captcha_success->success==true){
}
}else{
echo json_encode(array('invalidcaptcha'=>true, 'redirect'=> ''));
}
wp_die();
}
/*Validate Coupon Codes*/
