Keep the baseline
Record the price available without a code, membership, first-order status or extra basket condition.
DEEP DIVE · PROMOTION CONDITIONS
A discount counts only when its conditions fit.
A code or promotional banner does not automatically become every shopper's price. The comparison should identify who can use the offer, what basket it requires and whether it can be combined with other benefits.
Name the condition
Capture minimum spend, eligible products, customer status, channel, market and stated end time.
Test the intended basket
Use a code shown by the retailer or one that the retailer checkout accepts for the exact item, shopping country and basket.
Preserve failure
If the code is rejected or removes another benefit, keep that result rather than advertising the headline percentage.
PRICE TYPES
Public, conditional and personalized prices are different evidence.
A public sale price can usually be observed without identifying the shopper. A first-order, account, app or loyalty price depends on eligibility and should be labelled separately.
Personalized codes and targeted offers should not be presented as generally available. A comparison also should not request or store a shopper's private account data merely to produce a lower-looking result.
Stacking rules matter. A coupon that removes free shipping or cannot be combined with a sale may increase the final basket even when the item line decreases.
Unconditional
Available in the shopping country without a private account or code.
Coupon
Show the retailer code, eligibility, basket rule and expiry when available.
Account benefit
Do not treat a membership price as the default public price.
Channel-specific
Label app-only or device-specific offers and preserve the public alternative.
RANKING DISCIPLINE
Do not let the biggest percentage become the answer.
Compare the retailer-observed checkout outcome for the intended shopper and basket. If eligibility is unknown, rank the unconditional route and show the conditional opportunity separately.
Every displayed promotion should retain its source, terms and check time so an expired or withdrawn code can be removed promptly.