1. We have a form in Drupal 9 site where customers can enter a drop off data and pickup date. We want the pickup date to be minimum three days from drop off and add total number of days automatically as total days field.
2. Price filed addition which is equal to price x days.
3. On Submit Form action; the price move to cart.
4. Need to add service fee, airport fee and tax on price and make a grand total for checkout.