ADR-004 — Rank on cart total, never on item price

#Status

Accepted.

#Context

The first extractor captured a single visible price. Item prices ignore delivery fee, service fee and discounts, which often decide which option is cheaper.

#Decision

Rankings and market statistics use CartQuote.totalCents only. Item-only observations are kept as context but excluded from ranking with an explicit reason. A cart is comparable only if every line matches the requirement and the total quantity matches.

#Consequences

• The extension must extract subtotal, fees, discount and total per label.
• Fewer observations qualify, which is preferable to wrong comparisons.