What is C-TAP and why does it matter to your business? The Benelux terminal standard explained
One terminal. No hardware changes. The acquirer that fits your business. In the Benelux, that flexibility comes from a single standard called C-TAP, the dominant protocol between terminals and acquirers in the Netherlands and Belgium.
Point of sale, or in-person payments, can seem simple compared to the fractured European ecommerce payment scene with its many regional payment methods. Across Europe, there are multiple protocols for accepting various debit and credit cards in-person. For the Benelux market, MultiSafepay has chosen to support C-TAP next to our SmartPOS solutions. C-TAP is the dominant protocol used between payment terminals and acquirers in the Netherlands and is primarily used in the Benelux.
In the following paragraphs, we explore why C-TAP is so popular, where it differs from SmartPOS, and the advantages of using C-TAP through MultiSafepay.
What is the C-TAP protocol?
C-TAP stands for Common Terminal Acquirer Protocol. Think of it as the language a payment terminal uses to talk to an acquirer, the party that authorizes and settles each card transaction.
The protocol was set up between terminal manufacturers and acquirers to standardize payment processing and security. This greatly reduces the cost of introducing new devices and services to the market, and it promotes innovation. On top of that, participants agreed not to charge eachother interchange fees, as is common practice elsewhere. That significantly reduces transaction costs. It lets merchants keep the cost of handling in-person payments low.
The specifications are maintained by Acquiris, the C-TAP certification body within the SEPA region. Acquiris keeps the standard in line with market demand and technology, and certifies that terminals conform to it. As an acquirer and an Acquiris member, MultiSafepay supports the C-TAP protocol.
Why C-TAP is the standard for payment terminals in the Benelux
C-TAP was built to solve one problem: merchants locked into a single acquirer, unable to switch. Because it's an open, multi-acquiring protocol, one terminal can connect to multiple acquirers. Even several at once, so no single party controls your setup. You choose the acquirer that fits your business, and that choice stays yours.
That protection against lock-in is why C-TAP became the backbone of in-person payments in the region. According to the Dutch Payments Association, C-TAP is the dominant protocol between terminals and acquirers in the Netherlands, where roughly half a million payment terminals are in use across shops, restaurants, stations, and more.
Belgium tells a similar story. In-person card payments are simply everyday life there. In the 2025 Digital Payments Barometer, six in ten Belgians said they had made a contactless card payment in the past week, and 77% felt completely comfortable using it. In 2024, Belgians made 1.9 billion in-store payments with a Bancontact card alone. C-TAP terminals in Belgium also handle extralegal benefits like meal vouchers, ECO vouchers and gift cards from companies like Monizze and Edenred, which matters for hospitality and retail.
Two markets, one standard. Whether your customers tap in The Netherlands or Belgium, the terminal on your counter most likely already works with C-TAP.
Thanks to the straightforward migration from C-TAP terminals to MultiSafepay, merchants can benefit from an omnichannel payment experience that seamlessly connects online and in-store.
Wouter van Gessel, Product Manager POS
C-TAP vs SmartPOS: a protocol and a device
These two often get mixed up, so here is the short version. C-TAP is a protocol. SmartPOS is our POS solution where Sunmi is the device. C-TAP is the standard your terminal uses to reach the acquirer. SmartPOS is a category of smart, app-ready terminals that bring payments, ordering, and business tools together in one device. You may also hear about CTEP, a separate protocol that connects your cash register to the terminal. Different job, different layer.
Why does the distinction matter? Because it means switching acquirers doesn't have to mean switching hardware. Keep the C-TAP terminal you already own and switch acquirer whenever it suits your business. Or move to a modern SmartPOS device when you're ready for one. Either way, nothing forces you to start from scratch.
What managing C-TAP with MultiSafepay means for your business
Payment terminals are built to last, and they are expensive to buy up front. C-TAP lowers the barriers that come with that: There is no hardware investment needed lets you accept every card scheme on one terminal, and puts you in control of your setup. But a terminal is only part of the picture. Most providers still run online and in-person payments on separate systems, which leaves you switching between tools to find a single transaction. We do it differently. With MultiSafepay, your C-TAP payments sit on the same platform as your online payments, in real time, in one dashboard. One integration. Every channel. It's the first step towards a true omnichannel setup, and the difference between handling payments and growing on them.
So, what does it mean to choose a payment provider that also acts as an acquirer on the C-TAP standard? For merchants processing in-person payments, it comes down to a few concrete benefits:
- Keep your terminal: Our software runs on your existing C-TAP hardware
- One platform: C-TAP next to every other payment method
- One dashboard: Reconciliation, accounting, and reporting, automated
Ready for your next step?
Are you currently processing POS payments through a C-TAP terminal and thinking about the next step for your business? Contact us to discover the possibilities.
<h6>What is the C-TAP protocol?</h6>
C-TAP (Common Terminal Acquirer Protocol) is the standard language a payment terminal uses to communicate with an acquirer. It was set up between terminal manufacturers and acquirers to standardize in-person payment processing and security. The specifications are maintained and certified by Acquiris within the SEPA region. In the Benelux, C-TAP is the dominant protocol for payment terminals.
<h6>What is the difference between C-TAP and CTEP?</h6>
They work at different layers of the same payment. CTEP connects your cash register or POS software to the payment terminal. C-TAP connects that terminal to the acquirer, the party that authorizes and settles the transaction. In short: CTEP handles register-to-terminal, C-TAP handles terminal-to-acquirer.
<h6>Do I need to replace my payment terminal to switch acquirers?</h6>
No. That is the main advantage of C-TAP. Because it is an open, multi-acquiring protocol, you can switch acquirers and keep the terminal you already own. Terminals already in use do not need to be replaced to keep working.
<h6>What is the difference between C-TAP and SoftPOS?</h6>
C-TAP is a protocol. SoftPOS is a way of accepting payments. SoftPOS, often called Tap to Pay, turns a compatible device that supports NFC into a contactless terminal without extra hardware. C-TAP is the standard that connects a dedicated payment terminal to an acquirer. One is software on a phone, the other is the language your terminal speaks.
<h6>How do I know if my terminal supports C-TAP?</h6>
Most payment terminals in the Netherlands and Belgium already run on C-TAP. You can recognize a certified terminal by its unique identification number, sometimes shown as a CT-number or CTAP-ID. If you are not sure, your payment provider can confirm whether your terminal is C-TAP certified and ready to switch.
