Direct answer: Mundpay's fraud prevention protects international sales through layers that stack on top of each other. Smart retry separates a technical decline from a suspicious attempt, the proactive risk team monitors patterns and talks to the seller before any restriction, and pre-chargeback handling resolves about 90% of alerts before they turn into a refund. All of this works to keep chargebacks below the tolerated limit of 0,90%, the ceiling that, if crossed, puts the account at risk. Each chargeback costs a fixed R$ 60.00 plus repayment of the gross amount. And none of this exempts the seller: delivery, clarity, and support stay on their side.

Why Does International Selling Attract More Fraud and Chargebacks?

Selling to Brazil and selling to the United States or Europe are different games. In a domestic sale, the buyer knows the brand, pays in reais, and complains to the seller first. In an international sale, almost all of that shifts.

The buyer is in another country, pays with a card issued by a bank that has never heard of your product, and has the power to dispute the purchase directly with that bank, without going through you. Higher-ticket categories widen the problem: a global digital product runs around USD 20, but nutra sold in the US and Europe gets close to USD 300 per sale, a value that attracts both stolen-card fraud and buyer's remorse that turns into a dispute.

The result is that the chargeback rate climbs easily in international operations. And since every gateway answers to a limit tolerated by acquirers, letting that number run loose is not just losing money on each refund, it is risking the account itself. That is why fraud prevention needs to be designed for this scenario, not adapted from it.

What Does Good Fraud Prevention Need to Do?

Fraud prevention is not a block button. A well-built system needs to balance two forces pulling in opposite directions: stopping the fraudulent transaction without stopping the legitimate sale. Erring on the side of fear drives down the approval rate and kills revenue; erring on the side of permissiveness fills the account with chargebacks.

In practice, good fraud prevention for international sales needs four things:

  • Distinguish a decline from fraud. A declined international card can be a technical error from the issuing bank, not a criminal attempt. Treating both the same throws away a good sale.
  • Act before the damage. Resolving the dispute at the alert stage, not after the refund, is cheaper and does not count against your rate.
  • Protect the data. Every transaction travels with end-to-end encryption, and data handling follows payment security rules and Brazil's LGPD data protection law.
  • Have people, not just code. Ambiguous patterns need human review that talks to the seller instead of simply cutting them off.

This combination is what separates fraud prevention that protects from fraud prevention that gets in the way. Mundpay organizes these functions into layers, and that is what comes next.

How Does Mundpay's Fraud Prevention Work?

Mundpay's fraud prevention is not a single barrier, it is three layers that stack across the transaction's life cycle. Each one covers a different moment of risk.

Layer 1: smart retry. When a card is declined, the system does not give up or treat the decline as automatic fraud. It routes the transaction to alternative acquirers or banks in fractions of a second, recovering legitimate sales that would otherwise be lost to a technical "no." This protects the approval rate and, at the same time, feeds the system with signals about what is a normal decline and what is a suspicious pattern. We cover this mechanism in detail in the article on smart payment retry.

Layer 2: proactive risk team. Instead of blocking the account without warning, the risk team monitors sales patterns and contacts the seller before any restriction. That is the philosophical difference that sustains the system. Here we treat the risk team as one of the technical layers; the human side, the logic of mutual trust, and how that conversation happens in practice are covered in the article dedicated to Mundpay's risk team.

Layer 3: pre-chargeback. Before a refund becomes formal, the banking system issues a pre-chargeback alert. Mundpay uses that window to resolve the dispute preventively, with a refund or clarification, before the chargeback is recorded and counts against the seller's rate. Approximately 90% of these alerts are resolved at this stage, before turning into a formal chargeback. The cost is R$ 80.00 per alert, far cheaper than the loss from a completed refund.

All three layers work on transactions that travel with end-to-end encryption. Together, they attack the risk in three stages: they recover the good sale, they get ahead of the problem, and they put out the fire before it counts on the scoreboard.

What Is the 0,90% Chargeback Limit, and What Happens If You Cross It?

All the effort behind fraud prevention converges on one number: 0,90%. That is the maximum chargeback limit tolerated by acquirers over transacted volume. It is not a rule Mundpay invented, it is the ceiling the card networks and acquirers themselves impose on any payment operation.

As long as your rate stays below that value, the operation runs normally. The problem starts as you approach the ceiling:

  • Cost per refund. Each chargeback costs a fixed R$ 60.00 plus repayment of the gross sale amount. On high-ticket products like nutra, each refund hurts twice.
  • Restriction risk. Going past 0,90% puts the account at risk with the acquirers, not just with Mundpay. It is the kind of restriction that can lock down the entire operation.
  • Reserve already set aside. The 15% security reserve held for 60 days exists exactly as a cushion to cover disputes, and it is returned at the end of the period if there is no issue.

That is why the fraud prevention layers matter so much: every pre-chargeback resolved and every fraud attempt blocked keeps the rate away from the ceiling. The system does the technical work of holding that number down, but it does not work alone, and the next point is exactly your side of the account. If you want to understand how this care translates into platform reliability, it is worth reading about why Mundpay is legit.

Worth pausing here: a chargeback is not an isolated event, it is a symptom. In practice it almost always points to something before the purchase, on the page, in the delivery or in the name on the statement.

Wellington CostaGlobal Payments Specialist

What Should the Seller Do on Their Own Side?

Here comes the honest part: fraud prevention reduces and anticipates the risk, but it does not exempt the seller. A good share of chargebacks do not come from criminal fraud, they come from a dissatisfied, confused, or surprised buyer. The system cannot solve that alone, you are the one who solves it.

What is on your side of the account:

  • Deliver what you promised. The promise on the sales page needs to match the product received. A gap between the two turns into a refund request and a dispute.
  • A clear descriptor on the statement. A buyer who does not recognize the name on the card statement disputes it as a reflex. An identifiable descriptor prevents a chargeback by mistake.
  • Support that responds. When the customer finds you before finding the bank, the dispute turns into an agreed refund, not a forced chargeback.
  • A visible refund policy. Making it clear how to get a refund reduces the incentive to go to the bank. Refunding is cheaper than taking a R$ 60.00 chargeback plus repayment.
  • An honest offer. An overhyped page attracts sales the buyer will regret. Mass regret is the fastest path to the 0,90% limit.

Think of it this way: Mundpay blocks technical fraud and gets ahead of the dispute, you control satisfaction. The two together keep the rate healthy. Neither one alone gets the job done. For a complete view of the platform's cost-benefit relationship in this context, see whether Mundpay is worth it for your operation, and check the detailed numbers on the payments and fees page.

In Short: Mundpay's Fraud Prevention

  • International sales attract more fraud and chargebacks because the buyer is in another country, pays in another currency, and can dispute the purchase directly with the issuing bank.
  • Mundpay's fraud prevention works in three layers: smart retry, a proactive risk team, and pre-chargeback handling, over transactions with end-to-end encryption.
  • About 90% of pre-chargeback alerts are resolved before turning into a formal refund, at a cost of R$ 80.00 per alert.
  • The maximum tolerated chargeback limit is 0,90% of volume; each chargeback costs a fixed R$ 60.00 plus repayment of the gross amount, and going past the ceiling puts the account at risk.
  • The 15% rolling reserve held for 60 days works as a cushion to cover disputes.
  • The system blocks technical fraud, but it does not exempt the seller: delivery, a clear descriptor, support, refund policy, and an honest offer remain the seller's responsibility.

A chargeback ratio never spikes, it climbs quietly. By the time the platform warns you, three months of damage is already booked. Anyone watching it week by week is never caught off guard.

Wellington CostaGlobal Payments Specialist

Frequently Asked Questions About Fraud Prevention in International Sales

Why does international selling generate more chargebacks?

Because distance raises the risk on every end. The buyer is in another country, pays in another currency, uses a card issued by a bank that does not know the seller, and can dispute the purchase directly with the issuer. Higher-ticket categories, like nutra sold in the US and Europe, attract both stolen-card fraud and buyer's remorse that turns into a dispute. That is why, in international sales, fraud prevention is not an extra, it is what decides whether the operation survives the tolerated chargeback limit.

How does Mundpay's fraud prevention work?

Mundpay's fraud prevention works in layers. Smart retry routes declined transactions to alternative acquirers and separates a technical decline from a suspicious attempt. The proactive risk team monitors patterns and contacts the seller before any restriction. And pre-chargeback handling resolves the dispute at the alert stage, before it becomes a formal chargeback: about 90% of alerts are resolved before turning into a chargeback. All transactions travel with end-to-end encryption.

What happens if my chargeback rate goes above 0,90%?

0,90% is the maximum chargeback limit tolerated by acquirers over transacted volume. Below it, the operation runs normally. As you approach or cross that ceiling, the account risks restriction from the card networks and acquirers themselves, not just from Mundpay. Each chargeback already costs a fixed R$ 60.00 plus repayment of the gross sale amount, so blowing past the limit adds financial loss on top of threatening the operation's continuity. Keeping that rate low is a shared responsibility between gateway and seller.

What is pre-chargeback and why does it matter?

Pre-chargeback is an alert issued by the banking system before a chargeback becomes formal. It opens a window to resolve the dispute preventively, with a refund or clarification, before the refund is recorded and counts against your rate. At Mundpay the cost is R$ 80.00 per alert, and approximately 90% of alerts are resolved at this stage. It is cheaper and safer to handle the alert than to let it turn into a chargeback, which costs a fixed R$ 60.00 plus repayment and still pressures the 0,90% limit.

Does Mundpay's fraud prevention exempt the seller from responsibility?

No. Fraud prevention reduces and anticipates the risk, but it does not replace what only the seller controls. An honest offer, delivering what was promised, a clear descriptor on the statement, support that responds, and a visible refund policy knock down the biggest cause of disputes, which is a dissatisfied or confused buyer. The 15% rolling reserve held for 60 days exists precisely as a cushion to cover disputes. The system blocks technical fraud; the operation's reputation stays in the seller's hands.