Accepting online payments isn't just about adding a checkout button anymore. Businesses often need payment systems that match the way they operate, whether that's processing subscriptions, handling international transactions, supporting multiple currencies, or connecting payments with existing business software. Getting those pieces to work together usually requires more than installing a plugin.
Across Europe, many software development companies build payment functionality directly into custom websites, ecommerce platforms, mobile applications, and SaaS products. Some work with well-known providers such as Stripe, PayPal, Adyen, Klarna, or Mollie, while others develop tailored integrations that fit specific technical or regulatory requirements. This article looks at companies in Europe whose services include payment gateway integration as part of their broader software and web development expertise.
At Gilzor we build custom web platforms, ecommerce solutions, and business applications where payment processing becomes part of the overall system instead of a separate add-on. Payment gateway integration is included in projects that require secure online transactions, recurring billing, marketplace payments, or connections between payment providers and internal business processes. Depending on project requirements, we integrate third-party payment services into websites, web applications, and other digital products while keeping the payment flow aligned with the rest of the platform.
Our work around payment gateways is closely connected with custom software development, API integrations, backend engineering, and quality assurance. Rather than focusing only on the checkout itself, we help businesses connect payment functionality with user accounts, order management, subscriptions, reporting, and other features that support day-to-day operations. Each integration is adapted to the architecture and technical needs of the project.
OSKI Solutions develops custom software, web platforms, and ecommerce solutions for businesses that need tailored digital products. Payment gateway integration is part of their development work, helping companies connect secure online payment systems with websites, online stores, and custom applications. Depending on the project, they integrate payment providers into existing platforms or implement them during the development of new digital solutions.
Their team combines payment functionality with broader software engineering services, including backend development, API integration, and system modernization. This approach allows payment processing to work alongside customer accounts, order management, subscriptions, and other business features instead of operating as a standalone component.
Stripe builds financial infrastructure that helps businesses accept payments and expand their online revenue models. Its payment platform supports gateway integration for websites, mobile applications, SaaS products, marketplaces, and ecommerce stores, allowing businesses to process online and in-person transactions through a single system. The company also enables billing, card issuing, and cross-border money movement, making the platform suitable for a wide range of payment scenarios.
Payment gateway integration is supported through Stripe's APIs, which allow development teams to connect payment processing with custom software and existing business systems. Alongside payment acceptance, the platform includes tools for subscription billing, fraud protection, financial reporting, and international payments, giving businesses flexibility as their payment requirements evolve.
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PayPal operates a global digital payments platform that enables businesses and individuals to send, receive, and process online payments. Along with its consumer payment services, the company offers payment gateway solutions that help merchants accept transactions through websites, ecommerce stores, and mobile applications. Businesses can choose from different integration options depending on the level of customization they need, from ready-to-use checkout experiences to API-based implementations.
Security and payment flexibility are central parts of the platform. PayPal supports multiple payment methods, allows businesses to store and manage preferred payment options, and encrypts transaction data throughout the payment process. Its business tools also include invoicing, fraud protection features, and payment management capabilities that can be integrated into a variety of online sales environments.
Checkout.com develops a payments platform that helps businesses accept, process, and manage digital transactions across global markets. The platform supports online payments through a single integration while giving merchants access to multiple payment methods, currencies, and regional payment options. Its infrastructure is built for businesses that sell across borders and need payment processing that adapts to different markets.
Payment gateway integration is available through APIs that connect websites, mobile applications, and ecommerce platforms with Checkout.com's payment network. Along with payment acceptance, the platform includes fraud detection, payment optimization, reporting tools, and compliance features that help businesses manage transactions throughout the payment lifecycle.
Adyen is a financial technology company that brings payment processing, financial products, and data capabilities together within a single platform. Businesses use its technology to accept online and in-person payments while managing transactions across different countries, currencies, and sales channels. The platform is designed to replace fragmented payment systems with one connected solution.
Businesses integrate Adyen through APIs that connect payment functionality with websites, mobile applications, ecommerce platforms, and point-of-sale systems. Beyond payment acceptance, the platform includes support for local payment methods, risk management, reporting tools, and unified commerce features that help organizations manage payments across multiple markets from one environment.
Itexus specializes in custom software development with a strong focus on fintech, digital banking, and payment technologies. Payment gateway integration is one of the company's dedicated services, supporting businesses that need secure payment processing within web applications, mobile apps, ecommerce platforms, and financial products. Their engineers work with third-party payment providers through API-based integrations that fit different business models and technical environments.
Beyond payment connectivity, Itexus develops complete financial software solutions where payment processing becomes part of a larger ecosystem. Their projects often combine payment gateways with digital wallets, banking APIs, subscription management, transaction processing, and other financial services to create connected digital products.
Mollie offers a payment platform that helps businesses accept online payments through a single integration. The platform supports a wide range of payment methods commonly used across Europe, allowing merchants to connect their websites, ecommerce stores, and applications without building separate integrations for each payment option. Its API is designed to simplify payment implementation while giving businesses flexibility as they grow.
Beyond payment acceptance, Mollie includes tools for recurring payments, subscriptions, payment management, and reporting. Businesses can choose from hosted checkout pages or integrate payments directly into their own applications, depending on their technical requirements and customer experience goals.
Payoneer provides a financial platform that helps businesses, marketplaces, and professionals send, receive, and manage international payments. The platform is widely used for cross-border commerce, allowing companies to collect payments from customers, pay suppliers and contractors, and manage transactions across multiple countries and currencies through a single account.
Its payment infrastructure supports integration with ecommerce platforms, online marketplaces, and business systems, making international payment flows easier to manage. Alongside payment collection and payouts, Payoneer offers currency conversion, multi-currency receiving accounts, and business payment tools that support companies operating in global markets.
NOWPayments provides a cryptocurrency payment gateway that allows businesses to accept digital assets through websites, ecommerce stores, and custom applications. The platform supports a large selection of cryptocurrencies and offers APIs and ready-to-use plugins that simplify payment integration for different types of online businesses. Merchants can choose to receive payments in cryptocurrency or use conversion options where available.
Beyond payment acceptance, NOWPayments includes tools for invoicing, donations, recurring payments, and automatic conversion between cryptocurrencies and fiat currencies. The platform is designed to fit a variety of business models, giving merchants flexible ways to add cryptocurrency payments to their existing payment infrastructure.
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Soft-Pro develops custom software, web platforms, and ecommerce solutions for businesses across different industries. Payment gateway integration is included in projects that require secure online payments, enabling merchants to connect third-party payment providers with ecommerce platforms, customer portals, and business applications.
Beyond payment functionality, the company works on full-cycle software development, system integration, and long-term application support. Their projects combine payment processing with other business features, creating connected digital solutions that match the technical requirements of each client.
Nayax develops payment technology that enables businesses to accept and manage cashless payments across different industries. Their payment gateway connects merchants with payment processors, allowing online and connected systems to securely authorize and process transactions. The platform supports multiple payment methods, including payment cards, digital wallets, and mobile payments, and can be integrated with ecommerce platforms and other business systems.
Alongside payment processing, Nayax focuses on secure transaction management and tools that help businesses reduce payment-related risks. Their payment gateway incorporates encryption, fraud prevention features, and compatibility with widely used ecommerce platforms, making it suitable for businesses that need reliable payment infrastructure as part of their digital operations.
NMI develops embedded payment technology that helps businesses, payment providers, and software platforms accept and manage payments through a single ecosystem. Its payment gateway supports secure transaction processing while allowing organizations to integrate payment capabilities into their own products and services. A key part of the platform is its white-label architecture, which enables partners to deliver payment solutions under their own brand.
The platform is built around APIs and modular payment services that can be adapted to different business models. Along with payment gateway integration, NMI offers merchant onboarding, payment management, bank and card payment support, and tools that help businesses scale without replacing existing payment infrastructure. Its flexible approach makes the platform suitable for payment providers, ISVs, fintech companies, and businesses building embedded payment solutions.
Mobian Studio creates custom web and mobile applications for businesses working in industries such as fintech, healthcare, logistics, and ecommerce. Payment gateway integration is part of their development services, allowing businesses to connect secure payment processing with digital products through modern APIs and third-party payment platforms.
Their development process extends beyond payment functionality to include backend architecture, mobile development, and cloud-based solutions. By integrating payment services into larger software ecosystems, they help businesses support online transactions alongside the core features of their applications.
Paddle provides payment and billing infrastructure for software companies that sell digital products and subscription-based services. Instead of acting only as a payment gateway, the platform serves as a Merchant of Record, handling payment processing, billing operations, tax compliance, and regulatory responsibilities on behalf of businesses. This approach allows SaaS companies and app developers to manage global sales through a single platform.
Payment gateway integration is combined with subscription management, localized checkout experiences, and revenue optimization tools. Paddle also manages recurring billing, payment recovery, tax collection, and reporting, reducing the operational work involved in selling software across different countries. The platform is designed for businesses that want to combine payments, billing, and compliance within one solution.
Worldline develops payment technology that helps businesses accept, process, and manage payments across online, in-store, and omnichannel environments. As a European payment services provider, the company supports merchants and financial institutions with payment solutions that can be adapted to different industries and regional markets. Its platform includes local payment methods and features designed to meet the requirements of businesses operating across Europe and beyond.
Payment gateway integration is available through solutions that connect ecommerce platforms, business applications, and payment infrastructure into a unified payment environment. Along with payment processing, Worldline provides services for transaction management, payment acceptance, and merchant support, allowing businesses to manage payments through a single technology ecosystem.
A-Listware delivers custom software development services for businesses that need tailored digital products, including ecommerce platforms, enterprise systems, and web applications. Payment gateway integration forms part of projects that require secure online transactions, allowing businesses to connect third-party payment providers with their websites and applications through custom APIs and backend services.
Their engineering team combines payment functionality with broader software development, ensuring payment processing fits naturally within existing business workflows. Alongside payment integrations, the company works on cloud solutions, system modernization, and application support for organizations building scalable digital platforms.
WebPays focuses on payment solutions that enable businesses to accept and manage online transactions through a secure payment gateway. The company offers merchant accounts, credit card processing, custom checkout platforms, and payment gateway services for ecommerce businesses operating across multiple countries and currencies. Its solutions can be connected through APIs or ready-made plugins for widely used ecommerce and CMS platforms.
Businesses can integrate payment functionality without extensive coding by using the platform's existing plugins or API tools. Along with payment processing, WebPays supports multi-currency transactions, PCI DSS-compliant security, 3D Secure authentication, and real-time payment synchronization, giving merchants a single environment for managing online payments and transaction data.
21Century.Tech is an AI-native software development company that builds custom digital products for businesses across ecommerce, fintech, and other technology sectors. Payment gateway integration is included in projects where secure online transactions, subscription billing, or digital payment functionality needs to be incorporated into web applications and customer platforms.
The company combines software engineering with AI implementation, helping businesses connect payment infrastructure alongside automation, analytics, and business workflows. Their projects range from customer-facing applications to enterprise platforms that require reliable third-party service integrations.
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Net-Devs builds custom software and digital platforms for businesses that require secure integrations with third-party systems. Payment gateway integration is included in projects involving ecommerce, fintech, and enterprise applications, allowing payment functionality to be connected through APIs that fit each product's technical architecture. Their team works with custom web solutions where online payments become part of broader business workflows rather than a standalone feature.
Alongside payment integrations, Net-Devs develops backend systems, cloud-based applications, and enterprise software that support transaction management, customer accounts, and other connected business processes. Their engineering approach focuses on combining payment infrastructure with scalable application development to create solutions that can evolve as business requirements change.
Choosing a payment gateway integration partner depends on more than the list of payment methods a platform supports. Some businesses need a development company that can build payment functionality into a custom application, while others benefit from an established payment provider that already offers the infrastructure, compliance, and tools required to process transactions at scale. The right choice usually comes down to the type of product being built, the markets being served, and the level of flexibility the business expects as it grows.
The companies featured in this article represent different approaches to payment gateway integration across Europe. Some focus on custom software and API implementation, while others provide complete payment platforms with billing, fraud prevention, subscription management, or cross-border payment capabilities. Comparing their expertise, integration options, supported payment methods, and business focus can help narrow the search and identify a solution that fits both current requirements and future plans.
