1. Creating a custom URL that can me use as API. At first we need to use init hook in function.php
/* allow ajax request api for custom url*/
add_action('init', function(){
    add_rewrite_tag('%moms_type%', '([0-9]+)');
    add_rewrite_rule('ajax-api/momstype/([0-9]+)/?', 'index.php?moms_type=$matches[1]', 'top');
  
});

2. Use template_redirect hook for return response

/* Get Ajax request for changing cookies and set cookies */

add_action('template_redirect', function() {
    global $wp_query;
    $momsTypeId = $wp_query->get('moms_type');
    $momsType = ($momsTypeId == 1) ? "business" : "private";
    if(!empty($momsTypeId)){   

        setrawcookie('momsType', rawurlencode($momsType), time()+62208000, '/', $_SERVER['HTTP_HOST']);
        wp_send_json_success([
            'cookiesphp' => $_COOKIE["momsType"],
        ]);  
        exit;      
    }

});

3. Ajax call function from jquery script

    const requestSetCache = async (type) => {
        try {
        const response = await fetch("https://www.test.cirk-l.pl/ajax-api/momstype/"+type+"/");
        const data = await response.json();
        console.log({data});
        location.reload();
        }catch(err) {
            console.log(err);
        }
    }

4. Add click event to execute the Ajax request


    $("#momsType-footer").change(function (event) {
        if($(this).val() == "business"){

            requestSetCache(1);				
        }else{

            requestSetCache(2);					
        }
    });

By toihid