Integrate custom laravel cart

I need the following tasks done: - allow for products to get data from external source by matching up product title or code. - add stock options for products. If a product is limited by stock can we add a tick button of stock controlled and how many there is until it goes out of stock and doesn’t allow for it to be added to cart? also if it could display out of stock? and possibly have a low stock that also displays when down to a certain amount which is defined on the product as part of stock settings? - email template layouts, struct is already there, just need to dynamically create a invoice layout and get name for email notifications. Coupon to allow for bundles for example required items needed in the cart in order to give 10% off for example via a keyword match or something like this… - Upgrade all to https - integrate with another external users database so if user is logged in, then look up user from the other database and create session and match orders from our system for that user. - create export scripts for exporting invoice data, customer data, calculated fees and VAT rates and product data.