A discount that fires only when two named products are both in the cart — on every Shopify plan, and tested against sample carts before it goes live.

every rule in priority order: what the cart must hold, what comes off, Live / Off / Expired / Broken / Failed its test, and every warning in words.

name, checkout message, priority, most times per order, start and end dates, combines-or-not; the groups (products or single variants, how many per set); what gets discounted (one group, every item, the cheapest item, or the order total) and how (percent, amount off, fixed price for the set). Below the status sit the test carts: carts built from your products that must fire and must not. The rule cannot be switched on until every one is right.

pick or build a cart; see the total, each rule that fired (how many times, on which lines, and why), each that did not and why, the near-miss messages, and the exact JSON the Shopify Function would return.

pairs of live rules that want the same products: double-dips (critical), duplicates, and overlaps priority settles — each with the smallest cart that holds both and what it ends up paying.

stacking (each rule's choice, or never), which Function API, near-miss messages, the products (what read_products brings in), what gets published to the Function, look, backup and restore.