Bundles and discount codes
How the cart is priced.
Bundles
A bundle says “buy N downloads of one size for a set price”, for example 5 web downloads for $20. It is applied automatically when it beats the single prices, and mixed bundles such as 5 and 10 are combined to give the buyer the cheapest total.
Discount codes
A code takes a percentage or a fixed amount off. It can expire or have a use limit. Bundles apply first, then the code is taken off what remains. Shipping is never discounted.
Minimum charge
Stripe will not take a charge under $0.50, so a discount never brings an order below that.