Memberpress Signup - get forms by ajax

functions.php

/**
 * AJAX Custom Signup
 */

add_action('wp_ajax_es_mepr_signup_toggle_form', 'es_mepr_signup_toggle_form_callback');
add_action('wp_ajax_nopriv_es_mepr_signup_toggle_form', 'es_mepr_signup_toggle_form_callback');
function es_mepr_signup_toggle_form_callback()
{

    try {

        $plan_id = isset($_REQUEST['plan_id']) && !empty($_REQUEST['plan_id']) ? $_REQUEST['plan_id'] : 0;

        if (!$plan_id) {
            throw new Exception('$plan_id is undefined');
        }

        $plan_form = do_shortcode('[mepr-membership-registration-form id="' . $plan_id . '"]');

        if ($plan_form) {
            $response = ['error' => false, 'plan_id' => $plan_id, 'plan_form' => $plan_form];
        } else {
            $response = ['error' => 'Something is wrong !'];
        }

        wp_send_json($response);
        die();
    } catch (Exception $error) {
        wp_send_json(array("error" => $error->getMessage()));
        die();
    }

}

script.js

 function toggle_signup_form(signupContent, signupHeader, toggle, toggle_input) {
        const checked = !toggle_input.prop('checked')
        const plan = toggle_input.data('plan')
        const plan_id = checked ? plan.yearly.plan_id : plan.monthly.plan_id;
        const plan_price = checked ? plan.yearly.price : plan.monthly.price;
        const price = signupHeader.find('.es-signup__price')

        $.ajax({
            url: misfit.ajaxurl,
            type: 'POST',
            cache: 'false',
            data: {
                'action': 'es_mepr_signup_toggle_form',
                'plan_id': plan_id,
            },
            beforeSend: function (response) {
                signupHeader.addClass('disabled')
                signupContent.addClass('disabled')
                toggle.addClass('loading')
                toggle_input.prop('checked', checked)
            },
            success: function (response) {
                if (response.error) {
                    alert(response.error);
                } else {
                    signupContent.html(response?.plan_form)
                    price.html(`$${plan_price} / month`)

                    signupHeader.removeClass('disabled')
                    signupContent.removeClass('disabled')
                    toggle.removeClass('loading')
                    
                }
            },
        })
    }