NMI Payment Gateway UK: Features, Fees & Merchant Accounts

Everything UK businesses need to know about NMI, including gateway features, pricing, acquiring banks, integrations and merchant account options.

Updated: October 2026

Introduction

For businesses accepting payments online, choosing the right payment gateway is just as important as choosing the right merchant account. Transaction fees, security, integrations and the ability to work with different acquiring banks can all affect how smoothly your business operates.

The NMI payment gateway is one option worth considering, particularly for UK businesses looking for greater flexibility in how they accept and manage card payments.

Unlike payment services that combine processing and gateway functionality into one package, NMI can operate alongside different acquiring banks and merchant account providers. This can be useful for established ecommerce businesses, subscription services and merchants that need more specialised payment arrangements.

However, NMI is not necessarily the cheapest or simplest solution for every business. Gateway charges may be separate from card processing fees, and compatibility with your chosen acquiring bank needs to be confirmed before getting started.

In this guide, we explain how the NMI gateway works in the UK, its main features, potential costs, supported acquiring partners and whether it could be suitable for higher-risk businesses. We also compare NMI with Stripe and other payment gateways, and explain how to arrange an NMI-compatible merchant account.

What Is the NMI Payment Gateway?

NMI, originally known as Network Merchants, Inc., is a payment technology company providing gateway services to businesses, payment providers and software developers.

The NMI payment gateway allows businesses to securely accept and manage electronic payments through compatible acquiring banks and payment processors. When a customer makes a payment on your website, NMI helps transmit the transaction information to the relevant payment processor for authorisation.

The payment request is then passed through the card networks to the customer’s issuing bank. Once the transaction has been approved or declined, the result is returned to your website. This process normally happens within seconds.

NMI provides the technology that connects these different systems, but it does not automatically provide the merchant account required to process card payments. That is an important distinction for businesses considering NMI.

You will generally need a suitable acquiring arrangement alongside the gateway, although both services may be arranged through the same payment provider. NMI also provides functionality beyond standard e-commerce payments.

Depending on the services enabled, businesses can access virtual terminals, recurring billing, secure payment storage, reporting and integration tools. These features make NMI worth considering for businesses that need more control over how their payments are managed.

How Does NMI Work With Merchant Accounts and Acquiring Banks?

One of NMI’s main advantages is its ability to connect with different payment processors. Some payment providers supply the gateway and acquiring services together, meaning businesses use the provider’s own processing infrastructure.

NMI operates separately from the acquiring bank. This gives businesses the potential to choose a suitable merchant account while continuing to use NMI as their payment gateway.

What Is The Difference Between a Payment Gateway and Merchant Account?

A payment gateway provides the technology needed to securely transmit payment information, while a merchant account forms part of the acquiring arrangement that allows your business to accept card transactions and receive funds.

When a customer makes a purchase on your website, they enter their payment details at checkout. NMI securely sends the transaction request to the relevant payment processor, which communicates with the card networks and the customer’s bank to authorise the payment. Once the transaction has been approved or declined, the result is sent back through NMI to your website, usually within seconds.

If the payment is approved, the funds are subsequently settled into your business bank account according to your acquiring provider’s arrangements. While NMI handles the technical communication between these systems, your acquiring provider manages the merchant processing relationship.

This means your transaction fees, settlement times and merchant account terms are generally determined by your acquiring provider rather than NMI itself.

Can You Change Acquiring Banks While Keeping NMI?

In some cases, yes. If your new acquiring bank supports a compatible NMI connection, you may be able to retain the gateway while changing your merchant account provider. This can be useful for businesses that have already integrated NMI into their website or payment software. Rather than replacing the entire payment setup, it may be possible to change the underlying acquiring arrangement, however, compatibility must be confirmed before making the switch.

Your new merchant account will also need approval, and the gateway connection must be configured and tested.

If you are considering changing providers, our guide on how to switch card payment provider explains the process.

Which Acquiring Banks Work With NMI?

NMI supports connections to a range of payment processors, although availability depends on the country, payment platform and merchant account configuration. For UK businesses, choosing a compatible acquiring bank is an important part of setting up the gateway.

Payments World works with more than 20 acquiring and payment partners, including Worldpay, Elavon, Cashflows, emerchantpay and Adyen. These providers are among the options we can explore when discussing merchant accounts and potential NMI integrations.

Worldpay

Worldpay is an established acquiring provider offering card processing solutions to businesses of different sizes.

NMI documents supported Worldpay processing connections, although the specific UK ecommerce configuration needs to be confirmed.

Businesses already using Worldpay may wish to investigate whether their merchant account can support an NMI gateway.

Key Features
Worldpay offers online card processing, recurring payments, fraud prevention tools and ecommerce integrations. It supports businesses ranging from smaller retailers to established online merchants.

Pricing
Pricing varies depending on transaction volumes, business type and the services required. Tailored acquiring rates may be available for businesses processing larger volumes.

What to Consider
Worldpay has documented NMI processing connections, although compatibility with your specific UK merchant account and ecommerce setup needs to be confirmed.

Best For
Established e-commerce businesses looking for a recognised acquiring provider with a broad range of payment solutions.

Elavon

Elavon provides merchant acquiring services for businesses accepting card payments online and in person.

NMI documents certain Elavon processing connections, but compatibility depends on the relevant platform and payment arrangement.

Businesses considering Elavon should confirm that the proposed merchant account supports their intended NMI integration.

Key Features
Elavon offers online card processing, multi-currency payments, fraud prevention and e-commerce payment solutions. It supports businesses accepting payments from customers in the UK and internationally.

Pricing
Elavon offers tailored merchant account pricing based on transaction volumes, business type and processing requirements. Businesses with higher turnover may be able to negotiate more competitive rates.

What to Consider
Elavon has documented NMI processor connections, although compatibility with your specific merchant account, payment methods and integration needs to be confirmed.

Best For
UK e-commerce businesses selling domestically or internationally that want an established acquiring provider with multi-currency payment capabilities.

Cashflows

Cashflows is a UK payment services provider offering merchant acquiring and payment solutions.

For businesses considering Cashflows alongside NMI, the first step is confirming whether a suitable gateway connection is available for their particular requirements.

This should be established before proceeding with an application or technical integration.

Key Features
Cashflows offers online card processing, merchant acquiring, fraud prevention tools and payment reporting. Its solutions help UK businesses manage transactions across online and in-person sales channels.

Pricing
Cashflows provides tailored pricing based on transaction volumes, business type and payment requirements. Costs may include processing fees and additional charges depending on the services selected.

What to Consider
Cashflows offers its own payment gateway technology, so businesses looking to use NMI should confirm whether a compatible integration is available before proceeding.

Best For
UK businesses looking for flexible acquiring arrangements, integrated payment solutions and greater visibility over their payment processing.

e-Merchant Pay

emerchantpay provides payment processing and acquiring solutions, including services for businesses with more specialised requirements.

Merchants interested in combining emerchantpay with NMI should confirm the available processing connections and whether their business meets the provider’s underwriting criteria.

Compatibility and approval will depend on the individual arrangement.

Key Features
e-merchantpay offers online payment processing, recurring billing, fraud prevention and international payment solutions. It supports a range of ecommerce businesses, including those with more complex processing requirements.

Pricing
e-merchantpay provides tailored pricing based on transaction volumes, business sector, payment methods and risk profile. Rates and additional charges will depend on the merchant’s individual requirements.

What to Consider
e-merchantpay offers its own payment gateway technology, so businesses specifically looking to use NMI should confirm whether a compatible integration is available.

Best For
E-commerce businesses trading internationally, subscription-based services and merchants requiring more specialised acquiring arrangements.

Adyen

Adyen provides payment technology and acquiring services to businesses operating across different markets.

Businesses considering Adyen with NMI should establish whether the required gateway connection is supported for their specific UK payment setup.

Key Features
Adyen offers online and in-person payment processing, international card acceptance, multi-currency payments and advanced fraud prevention. Its unified platform helps businesses manage payments across multiple markets and sales channels.

Pricing
Adyen typically charges a processing fee alongside payment-method-specific charges. Costs vary depending on the payment methods accepted, transaction volumes and business requirements.

What to Consider
Adyen operates its own payment gateway and acquiring infrastructure, so businesses specifically looking to use NMI should confirm whether their required integration is supported.

Best For
Established e-commerce businesses, international retailers and larger merchants looking to manage payments across multiple countries and sales channels.

Finding a Compatible Acquirer

Although NMI supports a wide range of processing connections, it is important not to assume that every acquiring bank offers the same integrations.

Support can vary depending on the payment method, processing platform, business location and merchant account type.

NMI publishes information about its supported processors and devices, which provides a useful starting point.

If you are unsure which acquiring bank is suitable, Payments World can help you explore available merchant account and integration options.

NMI Gateway Features

NMI offers several features designed to support different types of payment processing. These range from standard e-commerce transactions to recurring payments and more complex merchant requirements.

The functionality available will depend on your gateway package, integration and acquiring arrangement.

NMI Virtual Terminal

The NMI virtual terminal allows authorised users to enter payment details through a secure online interface. This can be useful for businesses taking telephone orders, deposits or payments that are not completed through a website checkout. For example, a wholesaler may use a virtual terminal to process a payment from an existing customer over the phone.

A virtual terminal can reduce the need for a physical card machine in certain situations. However, businesses must ensure their merchant account permits the relevant transaction types.

Mail order and telephone order payments may also attract different processing charges and fraud risks.

NMI Subscription Payments

NMI supports recurring billing functionality for businesses collecting regular customer payments. This can be useful for membership organisations, subscription services and companies offering ongoing contracts. Instead of asking customers to complete a new payment every month, businesses can configure scheduled transactions.

Recurring billing can reduce manual administration and make regular payment collection more convenient. However, the acquiring bank must approve the intended business model.

Businesses also need to manage customer consent, cancellation requests and unsuccessful payments appropriately.

NMI Customer Vault & Tokenisation

NMI’s Customer Vault allows businesses to manage stored payment information through secure tokenisation. Rather than retaining full card details within their own systems, merchants can use tokens to reference payment information held securely by the gateway.

This can support repeat purchases and recurring billing. It can also reduce the amount of sensitive payment information handled directly by a merchant’s website or software. However, businesses still need to comply with applicable PCI DSS requirements.

The exact responsibilities depend on how the payment integration is configured.

E-commerce Integration

NMI provides APIs and integration tools that allow businesses to connect payment functionality to websites and software. This can be useful for merchants operating customised e-commerce platforms or requiring specific payment workflows. For example, a business may need its gateway to communicate with an order management system or subscription billing platform.

NMI can also be used with compatible third-party e-commerce integrations. Businesses using WooCommerce should check that their chosen integration supports their website version, required payment methods and gateway configuration.

If you are comparing payment solutions for an online store, our guide to payment gateways for WooCommerce provides further information.

Fraud Prevention and Security

Fraud prevention is an important consideration for businesses accepting payments online. NMI offers security and transaction management functionality that can help merchants manage certain payment risks.

Depending on the configuration, this may include address verification, card security code checks, transaction controls and additional authentication features.

For UK ecommerce businesses, appropriate support for Strong Customer Authentication and 3D Secure is particularly important. These measures can help reduce certain types of fraud, although no payment gateway can eliminate fraud or guarantee protection against chargebacks.

Businesses should confirm which security features are included in their proposed arrangement.

Transaction Reporting and Management

NMI provides tools for viewing and managing payment activity. Depending on the account configuration, merchants can review transactions, process eligible refunds and access payment reporting.

This can be useful for businesses that want greater visibility over their processing activity. Some configurations also support multiple merchant IDs or processing connections.

These arrangements can be relevant to businesses operating several brands or requiring separate acquiring relationships. However, each merchant account remains subject to the relevant provider’s approval and operating requirements.

How Much Does the NMI Payment Gateway Cost in the UK?

NMI payment gateway pricing in the UK varies depending on your payment provider, merchant account and the services you require. Unlike some payment platforms with fixed rates, NMI is often supplied as part of a tailored payment arrangement.

Some providers charge an initial setup fee to configure the gateway or connect it to your website. There may also be a monthly gateway charge, with additional costs for certain features or integrations.

Transaction fees are another consideration. Depending on your arrangement, NMI may charge a fee for each payment processed through the gateway, separate from your acquiring bank’s processing charges.

Your acquiring provider will typically charge a percentage of each transaction, although rates depend on factors such as monthly turnover, average transaction value, business sector and card types accepted.

For this reason, it is important to compare the overall cost of your NMI gateway and merchant account rather than focusing on individual charges.

Example of NMI Payment Processing Costs

Consider a UK business processing £20,000 per month across 500 online transactions. The following example shows how gateway and acquiring charges could combine.

Charge	Illustrative monthly cost
NMI gateway fee	£20
Gateway transaction fees at 10p per transaction	£50
Acquiring fees at 1.5%	£300
Total	£370

In this example, the business would pay £370 per month, equivalent to 1.85% of its card turnover. These figures are illustrative only and do not represent published NMI pricing or a Payments World quotation. Actual charges will depend on your provider and merchant arrangement.

A lower gateway fee does not always mean lower overall processing costs, which is why comparing the complete payment solution matters.

If you are considering NMI, Payments World can help you explore gateway pricing, integrations and merchant account options based on your business requirements.

Is NMI Suitable For High Risk Businesses?

NMI can be a suitable payment gateway for some businesses operating in sectors considered higher risk by acquiring banks. Its ability to connect with different payment processors can provide more flexibility for merchants that require specialist acquiring arrangements.

However, using NMI does not guarantee merchant account approval. The acquiring bank will assess factors such as your business sector, transaction history, chargeback levels and compliance requirements before deciding whether to offer processing services.

At Payments World, we work with acquiring partners supporting a wide range of businesses, from everyday retail and ecommerce to those with more specialised payment requirements. This includes exploring high-risk merchant account options where appropriate, subject to provider approval.

NMI vs Stripe and Other Payment Gateways

NMI and Stripe both allow businesses to accept online card payments, but they operate differently. Stripe is commonly used as an all-in-one payment platform, combining payment processing, gateway functionality and developer tools within one service.

NMI, on the other hand, can operate alongside different acquiring banks and merchant account providers. This gives businesses more flexibility when choosing how their payments are processed, although it may involve additional setup and separate charges.

Both options have advantages, depending on your business size, transaction volumes and payment requirements.

Feature	NMI	Stripe
Online payment gateway	Yes	Yes
Merchant acquiring	Separate compatible arrangement generally required	Generally included
Pricing	Depends on gateway provider and acquiring bank	Published standard rates and custom pricing
Recurring payments	Available	Available
Virtual terminal	Available	Dashboard and partner options, depending on requirements
Developer integrations	APIs and third-party integrations	Extensive APIs and integrations
Choice of acquiring bank	Supports compatible processing connections	Primarily uses Stripe’s payment infrastructure
Setup	May require separate gateway and merchant account configuration	Often simpler for standard businesses
High-risk acceptance	Subject to acquiring approval	Subject to Stripe’s eligibility policies

When Might NMI Be a Better Option?

NMI can be a good choice for businesses that want greater control over their payment processing arrangements. Rather than relying on a single provider for everything, merchants can use NMI alongside a compatible acquiring bank that suits their requirements.

This can be particularly beneficial for established ecommerce businesses processing higher transaction volumes, where negotiating competitive merchant account rates can make a noticeable difference to costs. It also offers flexibility for businesses that need specific integrations or may want to change acquiring providers without replacing their entire payment gateway.

When Might Stripe Be More Suitable?

Stripe is often a convenient option for startups and smaller businesses that want to accept online payments quickly without arranging separate gateway and merchant account services.

Its straightforward setup, published pricing and range of integrations make it accessible to businesses with relatively simple payment requirements.

However, as transaction volumes increase, it may be worth comparing Stripe’s fees against a tailored merchant account arrangement to see which offers better overall value.

What About Other Payment Gateways?

There are plenty of alternatives to NMI and Stripe, including payment solutions from Worldpay, Adyen and other established providers. Some combine gateway and acquiring services, while others offer more flexibility over how payments are processed.

Rather than choosing a gateway based on its name or advertised features alone, it is worth considering how well it integrates with your website, the payment methods it supports and the total cost of accepting payments.

At Payments World, we work with multiple acquiring partners and can help you compare online payment solutions, including gateway compatibility, processing fees and merchant account options.

The Pros and Cons of The NMI Payment Gateway

NMI offers several advantages for businesses looking for flexibility in how they accept and manage payments. However, there are also some limitations worth considering before choosing it over other payment gateways.

Advantages of NMI

Choice of acquiring partners: NMI supports connections with different payment processors, allowing businesses to explore merchant account options that suit their requirements.
Recurring billing: Supports subscription payments and regular customer billing without needing to collect payment details each time.
Virtual terminal: Allows businesses to process eligible telephone and manually entered payments through a secure online interface.
Ecommerce integrations: APIs and third-party integrations make it possible to connect NMI with websites and other business software.
Secure payment storage: Customer Vault and tokenisation support repeat transactions without businesses needing to store full card details themselves.
Transaction management: Reporting tools help businesses monitor payments, refunds and transaction activity.

Disvantages of NMI

Separate charges: Gateway fees and merchant account processing costs may be charged separately, making pricing less straightforward.
More involved setup: Connecting NMI to an acquiring bank and ecommerce platform may require additional configuration.
Integration compatibility: Not every acquiring provider supports the same NMI connections or payment methods.
Potential additional costs: Certain gateway features or services may involve extra charges.

Overall, NMI can be a good option for established businesses that want more flexibility over their payment processing arrangements. For smaller businesses with straightforward requirements, an all-in-one payment provider may be easier to manage.

How to Get an NMI Compatible Merchant Account in the UK

Getting started with NMI involves finding a suitable acquiring bank, confirming gateway compatibility and arranging the right merchant account for your business. While you can approach providers individually, working with a payments specialist can make comparing the available options much easier.

At Payments World, we work with more than 20 acquiring and payment partners and can help you explore NMI-compatible merchant account options based on your business requirements.

Step 1: Tell Us About Your Business
The first step is understanding how your business accepts payments and what you need from NMI. This might include an ecommerce gateway, recurring billing, a virtual terminal or integration with your existing website. We’ll also look at your approximate monthly card turnover, average transaction value and any specific processing requirements.

Step 2: Explore Suitable Acquiring Partners
Not every acquiring bank supports the same NMI integrations, so finding the right provider is important. Payments World works with acquiring partners including Worldpay, Elavon, Cashflows, emerchantpay and Adyen. We can explore suitable merchant account arrangements and check gateway compatibility with the relevant providers.

Step 3: Compare Pricing and Payment Terms
Once suitable options have been identified, the next step is reviewing the costs involved. This includes gateway charges, transaction fees, monthly account costs and any additional integration requirements. We’ll help you compare the available arrangements so you can make an informed decision based on the overall cost and suitability for your business.

Step 4: Apply for Your Merchant Account
Once you have selected a provider, the merchant account application can begin. This normally involves submitting business details, identification documents and relevant banking information. The acquiring provider will complete its own checks before confirming approval.

Step 5: Arrange Your NMI Integration
Once approved, your NMI gateway can be configured with the relevant processing connection and integrated with your website or payment software. The setup will depend on your chosen provider and technical requirements. Transactions and any additional payment features should be tested before going live.

Step 6: Start Accepting Payments
Once everything is approved, configured and tested, your business can begin accepting payments through its new arrangement.

Whether you’re already using NMI, exploring integration options or looking for more competitive processing rates, Payments World can help you find a suitable solution through our network of acquiring partners. Get an NMI Merchant Account Quote

How Payments World Can Help

Choosing the right payment provider can make a real difference to your business, from reducing transaction costs to improving how you take payments and manage your cash flow.

At Payments World, we work with more than 20 acquiring and payment partners, helping businesses across the UK find competitive, reliable payment solutions without having to approach multiple providers themselves.

We take the time to understand how your business operates, what you’re currently paying and what you need from your payment setup. Whether you’re launching a new website, switching providers, expanding your business or reviewing your existing rates, we can help you find an arrangement that works for you.

Our support goes beyond payment gateways. We can also help you explore card machines, online payments, virtual terminals, EPOS systems and business funding, giving you access to a wider range of services as your business grows. Get Your Free Payment Quote

Conclusion

NMI offers UK businesses a flexible way to accept online payments, with features including recurring billing, virtual terminals, secure payment storage and integrations with compatible payment processors.

For businesses that want greater choice over their acquiring arrangements, it can be an attractive alternative to an all-in-one payment platform. However, the right solution will depend on your transaction volumes, technical requirements and overall processing costs.

Choosing a payment provider is about more than the gateway itself. Competitive rates, reliable settlement, suitable integrations and ongoing support all play an important role in finding the right arrangement for your business.

At Payments World, we work with more than 20 acquiring and payment partners to help UK businesses compare payment solutions and find options that meet their needs.

Like this article? Check out the rest of our blog page for more helpful content.

Frequently Asked Questions

FAQs

Is NMI Available to UK Businesses?

Yes, NMI supports payment processing arrangements for UK businesses through compatible acquiring banks and payment providers. Availability will depend on your chosen provider, business type and integration requirements.

How much does the nmi gateway cost in the uk?

NMI pricing varies depending on the gateway provider and merchant account arrangement. Costs may include monthly gateway fees, transaction charges and separate acquiring fees.

Rather than looking at gateway pricing alone, businesses should compare the total cost of accepting payments, including processing rates and any additional services.

Do I Need a Merchant Account to Use NMI?

Generally, yes. NMI provides the payment gateway technology, while a compatible acquiring arrangement is responsible for processing card transactions and settling funds.

Some payment providers may offer the gateway and merchant account together, simplifying the setup and billing process.

Can I Use NMI With My Existing Merchant Account?

Potentially. If your current acquiring provider supports the relevant NMI integration, you may be able to connect the gateway without changing merchant accounts.

However, compatibility needs to be confirmed with your provider, as supported connections and configurations can vary.

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