We are building a small eCommerce site on Shopify that requires a few tweeks. There will only be 6 products sold on the site, along with 3 - 6 testimonials.
The ability to add a section to input a code prior to checkout, preferably at the same time as the customer clicks "add to card". This is not a discount code, just used to track the user.
Have a specific message displayed on the checkout page based off the code that was used during "add to card".
The testimonials are below the products. These consist of a picture and a few words (either below the picture or as an overlay). We would like these pictures to be clickable and bring the customer to a second page, such as a blog post. Also, if when the customer clicks a photo, a code can be "copied to clipboard".