Most merchants treat the outcome of their reply as final. The customer's bank rules for the customer, the money stays withdrawn and the case closes. That is wrong about a quarter of the time. A lost reply opens a second round if the bank says no (the card brands call it pre-arbitration). In it, the customer's bank can reopen the case with new evidence you have not yet answered. After that comes a final ruling by the card brand (arbitration). No service that drafts only the first response covers either stage, and the fees decide whether pursuing them pays.
The bank starts the second round on the customer's behalf. After reviewing your reply, it can accept it and close the case. Or it can reject it and present new evidence from the customer. Under Visa and Mastercard rules the bank cannot repeat arguments already rejected. The customer has to bring something you have not answered. That could be a fuller statement of fact, a communication trail you did not produce, or evidence under a framework you did not use.
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The notice arrives through the same payment company channel (Stripe, Shopify Payments and the like) as the original chargeback. The response window is similar: 30 days on Visa and 45 on Mastercard. Your response is a second reply written against the new evidence. A copy of the first response usually loses the second round the way it lost the first.
The second round also carries a card brand fee, separate from the original chargeback fee, that the loser pays. Visa's fee is currently in the $500 range, and Mastercard charges similar amounts under a similar structure. The original disputed amount stays at risk as well. Fighting the second round on a $300 dispute risks a further $500 to recover $300. Even a 75% win rate loses money on average at that size. The math starts to work when the disputed amount is well above the fee, which in practice means roughly $1,500 to $2,000 per case.
A final ruling by the card brand costs more. If the second round does not settle between the bank and you, the case can be filed with the card brand. Visa charges a filing fee plus a review fee that together exceed the second-round cost. Mastercard's economics are similar, and the loser pays both. Escalating a $1,000 dispute to a final ruling puts $1,000 or more in fees at risk on top of the disputed amount. A final ruling suits the largest disputes you have, where the fees are a small share of the recovery.
Most chargeback services stop at the first response. After a rejection, whether to pursue the second round, absorb the loss or move to another service is your decision.
Most merchants do best by handling your reply to the dispute carefully, refunding cases that cannot be won at the first stage, and escalating only large disputes where the math works. The habits that win the first reply carry into the second round. They are correct dispute reason reading, evidence assembled before drafting, and a response structure matched to the bank's review form. If your typical dispute is under $1,000, the fee math puts the second round out of reach for most of your disputes. At $500 per case, escalation makes sense only above the amount where a 50-to-60% win rate covers the fee with margin.