Documentation
Written for the person running the drop. Where something only half works, it says so.
Written for the person running the drop, not for a developer.
Everything here describes what the app actually does today. Where something doesn't work, or only half works, that's said plainly rather than left for you to discover during a launch — see Limits and honest answers.
You create a drop: some products, a start and end time, and how fast to let people through. Shoppers who arrive are held in a waiting room and released in batches. When someone is released they get a pass, and that pass is checked inside Shopify's checkout — so per-customer limits hold even against someone who skipped the queue entirely.
Worth knowing before you rely on any of it.