Sending post request with wp_remote_post not working correctly

I need to submit a form on the woo-commerce product page via restful API custom endpoint

the problem is the wp_remote_post not working correctly with me or me mostly I did something wrong.

The form is add to cart form and it has a lot of custom data, not the usual add to cart. for plugin called yith composite to specific

My code so far

add_action('rest_api_init', function () {
    register_rest_route( 'yith-composite', 'add-item',array(
        'methods' = 'POST',
        'callback' = 'yith_custom_add_item'
    ));
});

function yith_custom_add_item( WP_REST_Request $request ) {
    $currentuserid_fromjwt = get_current_user_id();
    $product_id = $_GET['id'];
    $url = get_permalink( $product_id );
    $user_cookie = wp_generate_auth_cookie($currentuserid_fromjwt, time() + (10 * 365 * 24 * 60 * 60), 'logged_in');

    $response = wp_remote_post( $url, array(
        'body'    = json_encode($request-get_json_params()['body']),
        'headers' = array(
                           'Content-Type' = 'multipart/form-data;',
                           'cookie' = 'PHPSESSID=2f3f5db725c728c627ada8196ca9d438; tk_ai=woo%3A4404G2GnKIS%2BNq44234vMsYl; wordpress_test_cookie=WP+Cookie+check; wp-settings-time-138=1574607034; wordpress_logged_in_856ec7e7dd32c9b2fc11b366505cf40d=' . $user_cookie
                       ),
    ) );
    return $response;
    exit;
}

I send the following body including bearer token with postman:

{
    "body": {
        "ywcp_selection[153CE4EE-C1A0-6D39-9AD5-58B51C5AB306]": -1,
        "ywcp_variation_id[153CE4EE-C1A0-6D39-9AD5-58B51C5AB306]": 124136,
        "ywcp_quantity[153CE4EE-C1A0-6D39-9AD5-58B51C5AB306]": 1,
        "ywcp_selected_product_value[153CE4EE-C1A0-6D39-9AD5-58B51C5AB306]": 10,
        "ywcp_selection[471BAD03-9C3B-B44E-8584-348A5F33F8A6]": -1,
        "attribute_pa_sphere[471BAD03-9C3B-B44E-8584-348A5F33F8A6]": "5-75",
        "ywcp_variation_id[471BAD03-9C3B-B44E-8584-348A5F33F8A6]": 110359,
        "ywcp_quantity[471BAD03-9C3B-B44E-8584-348A5F33F8A6]": 1,
        "ywcp_selected_product_value[471BAD03-9C3B-B44E-8584-348A5F33F8A6]": 102552,
        "quantity": 1,
        "add-to-cart": 102491
    }
}