Keep money in pence
The dated one-of-each merchandise base is£36.37,or3637p. The local ledger uses integer pence. A confirmed merchandise-only credit of£36.37 leaves zero merchandise cost;£36.38 is rejected as one penny above the base. The examples validate arithmetic,not an available promotion.
Full credit does not erase delivery
With a hypothetical£4.99 delivery charge,£1.25 additional tax and£0.00 other charge,a full merchandise credit leaves£6.24. Those are user-entered test figures,not merchant fees. The notebook source already says tax included,so do not add the same included tax again.
Unknown charges are not zero
Blank shipping,tax or other fields withhold the final total. Enter a confirmed zero where appropriate. The pen’s free-shipping statement still requires destination eligibility;the university keyring delivery charge remains unknown here. Separate sellers may require separate actual baskets rather than one pooled delivery assumption.
Check meaningful decimal boundaries
Three user-entered items at10p produce30p,and two at£47.99 produce£95.98. Exact matching credits must leave zero in both cases. Prices accept at most two decimal places and bounded nonnegative values;counts must be whole. Unsupported exponents,negative entries and oversized inputs are rejected instead of silently rounded.
Your final action
Replace dated tickets with the actual selected checkout and confirmed option charges. Verify the custom text and seller conditions before paying. The tool sends no order or personalisation information externally and cannot approve an affiliate relationship,guarantee stock or reserve a graduation-day delivery.
A concrete buying decision
A budget sheet can retain a known zero postage charge for an eligible seller while leaving another seller’s delivery blank. That is more accurate than forcing both to zero to obtain a convenient grand total. The tool withholds the final amount until every entered charge is explicitly known.
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 gifting/content/consumer-terms/commerce review remain pending.
The Personal Shop P0712A44 graduation notebook ↗
Rutherfords P02_SP780GRADUATION pen ↗
University of Aberdeen5060715320935 Class of2026 keyring ↗
Rutherfords shipping and personalised returns ↗
The Personal Shop delivery policy ↗
University of Aberdeen shop general shipping and returns terms ↗