Captcha WP AFFILIATES

Hi!

Please tell me how to integrate Сaptcha in the WP Affiliates plugin.

WP Affiliates has the following filters:

/**
    * Returns captcha field markup.
    *
    * @return captcha field markup
    */
    static function captcha_get( $value ) {
        $style = 'display:none;';
        $field = '<input name="' . Affiliates_Utility::$captcha_field_id . '" id="' . Affiliates_Utility::$captcha_field_id . '" class="' . Affiliates_Utility::$captcha_field_id . ' field" style="' . $style . '" value="' . esc_attr( $value ) . '" type="text"/>';
        $field = apply_filters( 'affiliates_captcha_get', $field, $value );
        return $field;
    }

    /**
    * Validates a captcha field.
    *
    * @param string $field_value field content
    * @return true if the field validates
    */
    static function captcha_validates( $field_value = null ) {
        $result = false;
        if ( empty( $field_value ) ) {
            $result = true;
        }
        $result = apply_filters( 'affiliates_captcha_validate', $result, $field_value );
        return $result;
    }

https://ww.wp.xz.cn/plugins/captcha/