The receipt is where an illegal surcharge stops being a suspicion and becomes evidence. The law itself expects complaints "supported by the customer's receipt" - so knowing what to look for, and keeping what you find, is most of the work of holding a business to the rule.
What the fee looks like on a receipt
Look for a separate line between the subtotal and the total - an amount you would not have paid in cash. Common labels: "card fee," "service fee," "convenience fee," "processing fee," "surcharge," or the popular euphemism "non-cash adjustment." It may be a percentage (3% and 4% are typical) or a flat amount, added at checkout after you chose to pay by card.
The label is irrelevant. If you paid with a debit card and the line added money to the posted price because of how you paid, it is the thing Act 751 prohibits.
"Ran as credit" doesn't make it legal
Your receipt may say the transaction ran as credit even though you paid with your debit card - that happens whenever you tap or sign instead of entering a PIN. The processing route changes; the card does not. A debit card is debit either way, and a fee applied to it is still banned. This routing confusion is the single most common way businesses charge illegal fees while believing they are compliant - our PIN vs. signature debit guide covers why.
Cash-discount look-alikes
Some receipts show the fee in reverse. A genuine cash discount starts from one posted price and subtracts for cash - that is legal. The look-alike posts a "cash price," then adds an amount back when you pay by card. If the shelf or menu price is the lower number and your debit receipt shows more, the "discount" is a surcharge wearing different clothes, and on debit it is prohibited. The tell: compare the posted price to what your card was actually charged.
Photograph the receipt today. Most register receipts are thermal paper, and the ink fades in weeks - sometimes days in a hot car. Take a photo the day of the transaction, and get the checkout signage in a second shot if a card fee is advertised.
Turn your receipt into a complaint
Louisiana's complaint process, set out in R.S. 51:3082(C), expects four things - all of which your receipt and phone camera cover:
1. The business's name and address.
2. The transaction date and amount.
3. The amount of the surcharge.
4. The receipt itself.
With those in hand, you are ready to file with the Attorney General - the Consumer Protection Hotline at 1-800-351-4889 or the online consumer complaint form.
What to do next
Reporting stops the fee going forward; a written notice gets your own money back. The same four details power both: the law gives you a refund path in which your written notice starts a 30-day clock for the business to fix the practice and reimburse the surcharge. Our reporting page has the official AG channels plus a free generator that builds the notice letter from your receipt details.