Visa 12.5 wins on transaction records. Cardholder claims they were charged the wrong amount. Merchant defense: pull authorization amount + settled amount + original invoice/order. If they match, win rate is 80–90%. If they don't match (rare), refund the difference and concede.
What Visa 12.5 covers
Visa 12.5 is "Incorrect Transaction Amount." Cardholder claims the amount charged doesn't match what they authorized.
Processing errors category (12.x). Response deadline: 30 days. Straightforward defense with transaction records.
Common triggers
- Currency conversion visible on statement differs from expected
- Tip amount adjusted after authorization (restaurants)
- Shipping/tax calculated at checkout differs from cardholder expectation
- Cardholder misread receipt or invoice
- Genuine merchant billing error (rare)
Majority of 12.5 disputes are cardholder confusion about calculated fees (tax, shipping, currency conversion).
The evidence stack
For 12.5 representment:
- Authorization amount — processor record showing the amount at auth.
- Settled amount — processor record showing the settled amount.
- Original invoice/order — customer-facing invoice showing itemized breakdown.
- Checkout flow screenshots — showing tax/shipping/currency calculations customer saw.
- T&Cs acceptance — if applicable (e.g. restaurant tip authorization).
3-sentence cover: "Cardholder [name], transaction [ID], [date]. Authorization was [$X], settled at [$X] — same amount, matches invoice attached. No incorrect amount was charged."
Win rate: 80–90% when records match. 0% when they don't (refund the difference).
Frequently asked questions
What is Visa 12.5?
"Incorrect Transaction Amount." Cardholder claims the amount charged doesn't match what they authorized.
What's the win rate?
80–90% when transaction records show authorization and settlement amounts match. 0% when they don't.
How do I handle currency conversion 12.5 disputes?
Show the checkout flow screenshot where the FX rate was displayed. Cardholder saw the converted amount at checkout.
Post reflects public documentation, industry surveys, and Aurai's own book of disputes as of the publish date. Visa, Mastercard, American Express, Discover, Stripe, PayPal, and Shopify are trademarks of their respective owners; Aurai is independent and not endorsed by any of them. Network rules change — always verify current official rules before acting on any specific tactic.