Start with the reference base
At the selected reference quotes,one£13.99 pad pack and two different£5.99 bag packs give£25.97 merchandise. This is a source-reference basket with availability limitations,not an accepted order. The ledger uses validated integer pence for actual entered prices and whole-pack quantities.
Allow exact full merchandise credit
A confirmed merchandise-only credit of£25.97 leaves exactly£0 merchandise. A£25.98 credit exceeds that base and is rejected. These are arithmetic tests,not a live voucher,credit-note validation or an available discount at any selected seller.
Retain confirmed extra charges
Shipping,confirmed additional tax and other charges remain separate. A test entry of£4.99 shipping and£1.25 additional charge still leaves£6.24 payable after a full merchandise credit. Those figures are test inputs,not observed supplier fees. A blank charge leaves the full total unresolved.
Reject ambiguous entries
Negative amounts,more than two decimal places,exponent notation,fractional purchase counts and values above the stated limit are rejected. Do not add tax twice to an inclusive quote. No order,address,payment details or animal health information is submitted by the tools.
Apply the distinction to a purchase
A second boundary test uses 47.99 GBPtimes two equals 95.98 GBP,and 0.10 GBPtimes three equals 0.30 GBP. These test prices verify exactmoney arithmetic;they are not new observed pad or bag offers.
Sources & scope
Checked November 5, 2026. Manufacturer and retailer references support the specific statements. Dated displayed prices are not final checkout quotes, performance rankings or performance testing. This shopping reference does not replace the exact product label or retailer instructions. Current received labels and independent veterinary/material/content/commerce review remain pending.
Beco UK Puppy Training Pads selected25-pad one-time reference ↗
Handicentre Earth Rated120 unscented refill rolls UNSCENTBIO120 ↗