finlabsindia/wp-content/plugins/ninja-forms/includes/Config/PluginSettingsReCaptcha.php

<?php if ( ! defined( 'ABSPATH' ) ) exit;

return apply_filters( 'ninja_forms_plugin_settings_recaptcha', array(

    /*
    |--------------------------------------------------------------------------
    | Site Key
    |--------------------------------------------------------------------------
    */

    'recaptcha_site_key' => array(
        'id'    => 'recaptcha_site_key',
        'type'  => 'textbox',
        'label' => __( 'reCAPTCHA Site Key', 'ninja-forms' ),
        'desc'  => sprintf( __( 'Get a site key for your domain by registering  %shere%s', 'ninja-forms' ), '<a href="https://www.google.com/recaptcha/intro/index.html" target="_blank">', '</a>' )
    ),

    /*
    |--------------------------------------------------------------------------
    | Secret Key
    |--------------------------------------------------------------------------
    */

    'recaptcha_secret_key' => array(
        'id'    => 'recaptcha_secret_key',
        'type'  => 'textbox',
        'label' => __( 'reCAPTCHA Secret Key', 'ninja-forms' ),
        'desc'  => '',
    ),

    /*
    |--------------------------------------------------------------------------
    | Language
    |--------------------------------------------------------------------------
    */

    'recaptcha_lang' => array(
        'id'    => 'recaptcha_lang',
        'type'  => 'textbox',
        'label' => __( 'reCAPTCHA Language', 'ninja-forms' ),
        'desc'  => 'e.g. en, da - ' . sprintf( __( 'Language used by reCAPTCHA. To get the code for your language click %shere%s', 'ninja-forms' ), '<a href="https://developers.google.com/recaptcha/docs/language" target="_blank">', '</a>' )
    ),

    /*
    |--------------------------------------------------------------------------
    | Theme
    |--------------------------------------------------------------------------
    */

    'recaptcha_theme' => array(
        'id'    => 'recaptcha_theme',
        'type'  => 'select',
        'options'   => array(
            array( 'label' => __( 'Light', 'ninja-forms' ), 'value' => 'light' ),
            array( 'label' => __( 'Dark', 'ninja-forms' ), 'value' => 'dark' ),
        ),
        'label' => __( 'reCAPTCHA Theme', 'ninja-forms' ),
        'desc'  => '',
    ),
));