bigcommerce.com custom code implementation

I have a bigcommerce store that lacks a couple features. www.2daysupps.com. Coming from Shopify, I had a way to way to generate links which automatically loaded coupons upon landing on the website. This a feature (from what I can gather) that is not standard in big commerce. I want to be able to generate site links which automatically load a discount code upon reaching the site. So for example - I have a Black Friday Sale with code BF20. Currently, I can make a code to the site, but the customers have to remember to load the code. I want to be able to make a store link on black friday and customers will have the BF20 code loaded in their cart for a better customer experience. In addition, I want to be able to create product pages that cannot be found via search function in the website. I need the ability to create a product page which has some additional setting that would be something like --- "ONLY visible via link". This way, these products cannot be found organically in teh website...only via unique page link.