What Is a Payment Gateway and How Does It Work? (2026)

A payment gateway is the software that takes your customer's card details at checkout, encrypts them, and passes the transaction to the bank that decides whether to approve it. It is the first link in a chain that ends with money in your business account, usually a day or two later.

That definition is the easy part, and it is where most explanations stop. The parts that actually cost businesses money sit around it: which provider will approve you in the first place, what you really pay once interchange and scheme fees are added to the headline rate, and how long your money sits somewhere else before it reaches you.

This guide covers how a payment gateway works in commercial terms, what each fee line on your statement means, how to choose between pricing models, and what the three payment providers available through Binderr charge.

Key takeaways

• A gateway is one part of a chain. Gateway, processor, acquirer and merchant account are four different things, and you almost always buy them bundled from one provider.
• There are two pricing models. Interchange++ shows you the underlying cost and adds a markup. Flat rate hides it. Interchange++ starts winning at roughly £100,000 a month on a £50 average order.
• Card origin drives your cost. Interchange on EEA consumer cards is capped at 0.2% on debit and 0.3% on credit. Cross-border interchange is not capped, which is why non-EEA cards cost two to three times more to accept.
• Approval is a credit decision, not a signup. Expect ownership documents and a real underwriting review. Two to three business days with Paypercut or Emerchantpay, seven to ten with IFX Payments.
• Chargebacks cost more than the sale. You lose the goods, the sale and a fee of around £23. Cross 1.5% and you enter a card scheme monitoring programme.

What Is a Payment Gateway?

A payment gateway is the software layer that captures card details at checkout, encrypts them and sends the transaction to be authorised. It does not hold your money, and it does not decide whether you are allowed to trade. On its own it is only one part of what you need to accept card payments online.

What a Payment Gateway Does Between Checkout and Your Bank Account

The gateway's job is narrow and important. It takes the card number, replaces it with a token so the real number never touches your server, applies whatever fraud rules are switched on, and sends the transaction down the line to be approved or declined. It then returns that answer to your checkout in about a second.

It also handles the unglamorous work afterwards: refunds, partial captures, retries on failed subscription payments, and the reporting you reconcile against your bank statement at month end.

What it does not do is just as important. A payment gateway does not underwrite you, does not hold your funds, and does not carry the licence that lets money move. Those belong to the acquirer. In practice you rarely buy a gateway on its own. You buy a bundle from a payment service provider, and the gateway is the part you can see.

Gateway, Processor, Acquirer and Merchant Account: Who Does What

These four words get used interchangeably by people selling them, which is why merchants end up unsure what they have actually bought. They are separate roles, and knowing which one is charging you is what makes a statement readable.

The practical read: your provider controls only its own markup. Interchange and scheme fees are set by Visa and Mastercard and passed through to everyone, so two providers quoting very different rates are usually differing on markup and on how much of the underlying cost they are hiding. If a business is repeatedly declined at this stage, the blocker is the acquirer rather than the gateway, which is why the route through a high risk merchant account exists as a separate product.

Internet, Digital and Electronic Payment Gateway: Are They Different Things?

No. An internet payment gateway, a digital payment gateway and an electronic payment gateway are the same product described in three different decades of marketing language. The payment gateway meaning does not change with the adjective.

The terms do carry a faint flavour. Internet payment gateway usually turns up in older enterprise documentation and in tenders. Digital payment gateway tends to appear where wallets and local payment methods are part of the pitch. Electronic payment gateway is the phrase legal and procurement teams reach for. Vendors use whichever their buyers search for.

If a provider tells you their digital payment gateway is a different category of product, ask what it does differently. The honest answer is usually about which payment methods are supported rather than about the gateway itself.

How Does a Payment Gateway Work, Step by Step?

A payment gateway works by turning a card entry at your checkout into an authorisation request, carrying it to your customer's bank through the card scheme, and bringing back an approval or a decline. The whole round trip takes about a second. The money itself arrives days later, and those are two separate events.

The Five Steps From Checkout to Settlement

Understanding how a payment gateway works matters commercially because each step is a place where a sale can be lost or a cost can be added.

1. Capture at checkout. The customer enters their card. The gateway tokenises it, so the card number is replaced by a reference and never lands in your systems. Strong customer authentication may add a verification step here, which is where some conversion is lost.
2. Authorisation request. The gateway sends the transaction to the acquirer, which routes it through Visa or Mastercard to the bank that issued the card.
3. Approve or decline. The issuing bank checks funds, fraud signals and its own risk rules, then answers. An approval reserves the money on the customer's card, it does not move it.
4. Capture. You confirm the sale, usually at dispatch. Ecommerce platforms often capture immediately, which is fine for digital goods and risky for anything you might not be able to ship.
5. Clearing and settlement. Transactions are batched, the scheme clears them, and the acquirer pays you net of fees. This is the step that takes days rather than seconds.

When the Money Is Actually Yours

Settlement usually lands between one and seven working days after the sale, and where you fall in that range is a risk decision made about your business, not a technical limit. A new merchant with no processing history and a high average order value waits longer than an established one.

Two things extend it. A rolling reserve holds back a percentage of your takings, commonly for six months, as cover against chargebacks. A delayed settlement cycle keeps everything longer. Both are underwriting tools, both are negotiable once you have history, and both hit cash flow harder than the headline rate does.

The businesses that feel this most are the ones already struggling for banking, where settlement, the merchant account and the bank account behind them are all being decided by the same view of risk.

What Does a Payment Gateway Cost?

Expect to pay between 1% and 3% of each transaction plus a fixed fee of 10p to 15p, with the range driven mostly by where your customers' cards were issued. On top of that sit monthly fees, setup fees, refund fees, chargeback fees and currency conversion, and those are where quotes stop being comparable.

The Fee Lines You Will See on a Statement

A payment gateway fee is never one number. It is a stack, and providers differ mainly in how much of the stack they show you.

Interchange is the line worth understanding, because it explains most of the price difference between two otherwise identical sales. Under Regulation (EU) 2015/751 consumer interchange in the EEA is capped at 0.2% for debit and 0.3% for credit, and the UK kept the same domestic caps. Cross-border transactions between the UK and the EU fall outside both regimes, and commercial cards were never capped at all. That is the whole reason a non-EEA card can cost you two to three times what a domestic one does, and it is not your provider being greedy.

Interchange++ Versus Flat Pricing, and Where It Flips

Interchange++ means you pay the actual interchange, the actual scheme fees, and a fixed markup on top. Flat pricing means one rate for everything, with the provider absorbing the variation and pricing in a buffer. Interchange++ is cheaper on average and harder to forecast. Flat is more expensive on average and easier to budget.

The useful question is where they cross. Take Emerchantpay's Interchange++ at a 0.8% markup plus £0.13 per transaction and £100 a month, against Paypercut's flat 1.29% plus €0.10 with no fixed costs, on EEA consumer debit cards.

Interchange at 0.2% plus scheme fees of roughly 0.1% puts the Interchange++ effective rate near 1.1%, about 0.19 points below the flat 1.29%. At £100,000 of monthly card volume that saves around £190. The higher fixed fee gives about £90 of it back across 2,000 transactions at a £50 average order, leaving £100, which is exactly the monthly fee. The two land level.

So the flip point is around £100,000 a month at a £50 average order value. Below it, flat pricing wins and the monthly fee is dead weight. Above it, Interchange++ pulls away and keeps pulling. Add the £500 setup fee spread over a first year and the first-year flip point moves to roughly £140,000 a month.

Two things move that number. A card mix weighted towards credit rather than debit raises interchange and narrows the gap, pushing the flip point up. A low average order value means more transactions for the same revenue, so the fixed fee per transaction matters more, which also pushes it up. Work it out on your own mix rather than trusting a headline rate.

The Costs That Are Easy to Miss

None of these appear in a headline percentage and all of them are real money. Refund fees punish returns-heavy retailers at £0.35 a time. Chargeback fees are charged whether you win the dispute or lose it. A rolling reserve is not a fee at all, it is a slice of revenue you cannot spend for months. Currency conversion is often the single largest hidden cost for anyone selling across borders. And a £100 monthly charge is expensive at low volume no matter how good the rate looks.

Payment Gateway Providers on Binderr, and What Each One Is For

Binderr works with three payment providers, and they are built for genuinely different businesses. Emerchantpay suits higher volume and high risk sectors. Paypercut suits EEA sellers who want no fixed costs. IFX Payments suits cross-border businesses where foreign exchange is the real cost. Pricing for all three is published below.

Emerchantpay: Interchange++ Pricing, and High Risk Friendly

Emerchantpay is a global payment service provider and acquirer, holding an Electronic Money Institution licence and operating across the UK, Malta, Spain, Ireland, Estonia, Germany and Cyprus. It covers online, in-store, mobile and phone payments through one gateway, with fraud tooling and alternative payment methods included.

Pricing runs on Interchange++. You pay the underlying interchange and scheme costs, plus a 0.8% markup and £0.13 per transaction. Fixed costs are £100 a month and £500 to set up, with refunds at £0.35 and chargebacks at £23. Onboarding is an application of about five minutes, approval in around three days, and roughly a week to go live.

The differentiator is the last line on its card: high risk friendly. Sectors that mainstream European acquirers decline outright, including gambling, adult, forex and supplements, have somewhere to go here. If you have been declined elsewhere and do not know why, the mechanics of that decision are covered in the guide to setting up a high risk payment gateway.

Paypercut: Flat EEA Pricing With No Fixed Costs

Paypercut is a European payments platform that takes cards, digital wallets, buy now pay later, payment links and local payment methods through a single integration, with multi-currency settlement behind it.

Pricing is flat and split by card origin. EEA consumer Visa and Mastercard transactions cost 1.29% plus €0.10. Everything else, meaning EEA business cards and all non-EEA cards, costs 2.69% plus €0.10. Buy now pay later runs through a separate aggregator at 5% plus €0.10. There is no activation fee, no monthly minimum, no subscription and no support charge, and you can cancel at any time. Onboarding is quick: a five minute assessment, preliminary approval in a day, and services provisioned within three.

The trade is transparency for simplicity. You will never see what interchange you paid, and on a mostly EEA book at modest volume you will probably not care. What matters more is the exclusion list. Paypercut does not service seven sectors, including cryptocurrency and blockchain, adult entertainment, cannabis, chemicals and material processing, and defence and arms. If you are in one of those, this is not your provider and the flat rate is irrelevant.

IFX Payments: Multi-Currency and FX for Cross-Border Sellers

IFX Payments is a UK Electronic Money Institution running multi-currency accounts, mass payments and foreign exchange on its own platform, alongside online payment processing, fraud monitoring and API integrations. It services all non-sanctioned regions, which is the widest reach of the three.

The gateway itself is listed as free, with card processing rates agreed directly with the provider rather than published. Onboarding takes seven to ten business days, longer than the other two, which is what a wider risk appetite and a full account relationship costs in time. You can see the IFX Payments gateway setup for what is included.

Choose it when foreign exchange is your actual problem. If you sell in five currencies and settle in two, the conversion spread will cost you more than any difference in processing rate, and having acceptance and FX in one place is worth more than a few basis points.

The Three Compared

Read the table with your own volume next to it. Under £100,000 a month on mostly EEA cards, Paypercut costs less and asks for nothing upfront. Over that, Emerchantpay's Interchange++ saves more each month than its fixed costs take. If your card mix is heavily non-EEA, Paypercut's 2.69% is a known ceiling while Interchange++ passes through uncapped cross-border interchange, so the honest answer is that it depends on your mix and is worth modelling rather than guessing. And if you are in a sector Paypercut excludes, the comparison never starts.

How to Choose a Payment Gateway

Choose in this order: where your customers' cards are issued, what your monthly volume is, and what sector you trade in. Card origin sets your cost floor, volume decides the pricing model, and sector decides whether you have a choice at all. Features come last, because most providers have the same ones.

Start With Where Your Customers' Cards Are Issued

This is the variable most merchants ignore and it moves cost more than anything else. An EEA consumer card carries capped interchange. A US consumer credit card does not, and a corporate card from anywhere is another step up again.

Pull last quarter's transactions and split them by card origin. If 90% are EEA consumer cards, optimise for that rate and treat the rest as noise. If 40% are international, your blended cost is far higher than the headline rate you were quoted, and local acquiring in your main markets will save more than switching provider for a better domestic rate.

Then Your Volume, Because It Decides the Pricing Model

Below roughly £100,000 a month, fixed costs dominate and flat pricing usually wins. Above it, the per-transaction saving on Interchange++ outruns the monthly fee and keeps compounding. Run the calculation from the fees section on your own numbers before you sign.

Volume also changes what you can negotiate. Markup, reserve percentage and settlement cycle are all movable once you have six months of clean processing history. None of them are movable on day one.

Then Your Industry, Because It Can Decide Everything

High risk is not a judgement about your business, it is a statement about chargeback probability and regulatory exposure. Gambling, adult, forex, supplements, travel, CBD, subscriptions with free trials and anything with delayed delivery all land in it.

If you are in one of those categories, the question is not which payment gateway is cheapest, it is which one will underwrite you at all. Expect a higher rate, a rolling reserve and a longer approval, and treat a provider that says yes instantly with suspicion. The high risk merchant account route covers what that process looks like end to end.

Getting Approved: What Providers Ask For and Why Applications Fail

Taking on a merchant is a credit decision. The provider is guaranteeing your customers' refunds and chargebacks, sometimes for months after you have been paid, so it underwrites you the way a lender would. That is why the application asks about ownership and history rather than just your website.

The Documents to Have Ready

Having these in one folder before you start is the difference between three days and three weeks. Nearly every delay in payment onboarding is a document that was requested twice.

• Incorporation documents. Certificate, memorandum and articles, and the current register of directors.
• Ownership evidence. Who ultimately owns the company, usually anyone above 25%, with the structure above any corporate shareholders.
• Identity documents. Passport and proof of address for directors and beneficial owners.
• Bank statements and processing history. Three to six months for the account you want settlement paid into, plus statements from your current provider if you have one. Chargeback ratios are read closely.
• The website itself. Terms, refund policy, contact details, pricing and a working checkout. This is checked manually more often than people expect.

Why Applications Get Declined

The decline reason is rarely given in useful detail, so it helps to know what is actually being assessed.

• Ownership that cannot be resolved. Layered holding companies and nominee shareholders slow everything down. Providers run the same business verification checks that payment firms are required to run, and an unresolvable structure is a decline rather than a delay.
• A prohibited sector. Every provider maintains a list. Paypercut publishes seven excluded sectors. Being on a list is not negotiable, so check it before applying.
• A mismatch between the website and the application. You describe consultancy, the site sells supplements. This reads as concealment and ends applications.
• No trading history and a high average order value. A new company selling £2,000 items is the classic bust-out profile and gets treated as one until proven otherwise.
• Sanctions and adverse media exposure. A director or owner connected to a sanctioned jurisdiction triggers the AML obligations every payment provider carries, and those are not commercially negotiable.

How Long Approval Actually Takes

Published timelines are realistic when your paperwork is complete. Paypercut runs a five minute assessment, gives preliminary approval within a day and provisions services in three. Emerchantpay takes about three days to approve and roughly a week to onboard. IFX Payments quotes seven to ten business days, reflecting the wider risk appetite and the account relationship behind it.

Applying direct to an acquirer without a route in is a different experience, often weeks, and the reason is simply that nobody is chasing your file. Firms that need to hold the licence themselves rather than ride on someone else's are looking at a different timescale again, as the FCA electronic money institution licence process shows.

Chargebacks, and What They Actually Cost You

A chargeback is a forced refund initiated by your customer's bank. You lose the sale, usually the goods, and a fee of around £23 whether you win or lose. Past a certain ratio you also lose the account, which is the part that ends businesses rather than dents them.

The Real Cost of a Single Chargeback

Take a £120 order. You refund £120, you have already shipped stock worth perhaps £45, you pay a £23 chargeback fee, and you spend staff time assembling evidence. The direct loss is close to £190 on a sale that earned you maybe £40.

That is why chargeback rate, not chargeback count, is the number your provider watches. Three disputes a month on 3,000 transactions is background noise. Three on 100 is a conversation about your account.

The Ratio That Puts Your Account Under Monitoring

Both card schemes run merchant monitoring programmes, and the thresholds tightened in 2026. Visa's Acquirer Monitoring Programme moved its threshold down to 1.5% on 1 April 2026, from 2.2%, measuring fraud and disputes together against settled transactions. Mastercard's Excessive Chargeback Merchant programme sits at the same 1.5% with a minimum of 100 chargebacks in a month, with a higher tier at 3% and 300.

Crossing those lines brings fines that escalate the longer you stay above them, and eventually termination. The practical implication is that a 1% chargeback rate that felt comfortable in 2024 is now uncomfortably close to a threshold, and the fix has to be operational: clear billing descriptors, responsive support, delivery tracking and honest subscription terms. No provider can price that problem away for you.

Common Mistakes When Choosing a Payment Gateway

Most of these cost money quietly for months before anyone notices, which is exactly why they are common.

Commercial Mistakes

• Comparing headline rates. A 1.29% flat rate and a 0.8% markup are not comparable numbers. One includes interchange and one does not.
• Ignoring fixed costs at low volume. £100 a month on £20,000 of processing is half a percentage point on its own.
• Forgetting the FX line. A 2% conversion charge on a third of your revenue costs more than any rate negotiation will win back.
• Optimising the domestic rate while half your cards are foreign. Local acquiring in your main markets is usually the bigger saving.
• Never renegotiating. Markup, reserve and settlement terms all move after six clean months. Almost nobody asks.

Compliance Mistakes

• Applying to a provider that excludes your sector. The exclusion lists are published. Read them first.
• Describing the business loosely on the application. Underwriters compare your words to your website, and a gap reads as concealment.
• Treating approval as the end of it. Providers monitor after onboarding. A sharp change in volume or average order value triggers a review, and unexplained ones lead to held funds.

The Bottom Line

A payment gateway is the easy part of accepting payments. The decisions that matter are commercial: which pricing model suits your volume, how much your card mix really costs, and which provider will underwrite your sector.

If You Sell Mainly in the EEA

Start with flat pricing and no fixed costs. Paypercut's 1.29% plus €0.10 on EEA consumer cards with nothing monthly is hard to beat below roughly £100,000 a month, and the onboarding is measured in days. Revisit the decision when you cross that volume, because the maths flips and keeps moving in Interchange++'s favour after it.

If You Sell Internationally, or You Are High Risk

Look at Emerchantpay first. Interchange++ at a 0.8% markup gives you visibility into what cross-border interchange is actually costing you, and it is the only one of the three that says yes to high risk on the face of it. If your real problem is currency rather than risk, IFX Payments puts acceptance, multi-currency accounts and FX on one platform, which usually saves more than a better processing rate would.

Related reading: how to set up a high risk payment gateway, opening a high risk merchant account, opening a high risk bank account, and setting up a payment gateway company in Malta if you want to be the provider rather than the merchant.

FAQs About Payment Gateways

The questions merchants ask most often before they choose a provider.